NASA calls on China to be 'open and transparent' with its lunar missions after revelation that its potential landing sites OVERLAP with US destinations on the moon's south pole

• NASA identified 13 potential landing sites for Artemis 3, while China's Chang'e-7 also picked three sites near the moon's south pole that overlap with the US 
• 'We encourage transparency and peaceful exploration of space, per the tenets of the Artemis Accords and the Outer Space Treaty,' NASA said 
• Chang'e-7 is set for 2024 - it will be uncrewed and consist of an orbiter, lander, a mini hopping probe and a rover - while Artemis 3 is set for 2025
• 'Just as the lunar South Pole is of scientific interest to NASA, it is also of scientific interest to other nations, so overlap ... is to be expected,' NASA said

By CHRISTOPHER CARBONE U.S. SCIENCE AND TECHNOLOGY EDITOR FOR DAILYMAIL.COM

NASA has called on China to be 'open and transparent' with its lunar missions following a revelation of overlap between the two nations in potential landing sites near the moon's south pole.

'Just as the lunar South Pole is of scientific interest to NASA, it is also of scientific interest to other nations, so overlap in potential landing regions is to be expected,' NASA told DailyMail.com. 

The American space agency earlier this month identified 13 potential landing sites for the Artemis 3 crewed mission that's currently scheduled for late 2025 and will be the first time Americans set foot on the lunar surface in a half century.   

In a Chinese journal article on possible landing sites authored by Chang'e-4 lunar mission commander Zhang He and others, 10 spots are mentioned. Artemis 3 and Chang’e-7 both identify sites near Shackleton, Haworth and Nobile craters as potential landing zones.

'We’ll continue to share our plans with the world as we are able, and hope that other nations will share their plans with us. We encourage transparency and peaceful exploration of space, per the tenets of the Artemis Accords and the Outer Space Treaty,' the American space agency said.

NASA has called on China to be 'open and transparent' with its manned lunar missions following a revelation of overlap in potential landing sites near the moon's south pole between the two countries

'In exploring the Moon, we will follow what we have spelled out in the Artemis Accords—that we will be transparent about all activities, operate in a safe and responsible manner, and avoid harmful interference,' NASA added.

'We want to be as open with the international community as we can, and as a recent example, we announced 13 candidate landing regions for Artemis III.' 

The space agency already discusses its plans at several forums, including the International Space Exploration Coordination Group (ISECG), of which China is a member. 

Chang'e-7, which is named after the Chinese moon goddess Chang'e, will be uncrewed and consist of an orbiter, lander, a mini hopping probe and a rover, is set for 2024.

The American space agency earlier this month identified 13 potential landing sites for the Artemis 3 crewed mission that's currently scheduled for late 2025 and will be the first time Americans set foot on the lunar surface in a half century

The overlapping sites are partly the result that region of the moon's higher elevation, good lighting and proximity to shadowed craters that may trap water-ice, according to SpaceNews, which first reported the news

The overlapping sites are partly the result that region of the moon's higher elevation, good lighting and proximity to shadowed craters that may trap water-ice, according to SpaceNews, which first reported the overlap.

It remains to be seen how the rival nations would deal with potential conflicts due to the 2011 Wolf Amendment - which prohibits NASA from using government funds to engage in direct, bilateral cooperation with the Chinese government and China-affiliated organizations without explicit authorization from Congress and the FBI.

However, in 2015 the Obama administration began something called the U.S.-China Civil Space Dialogue, which allowed for discussion of space matters; that was continued into the Trump administration.

A State Department spokesperson told the space outlet on background: 'The last U.S.-China Civil Space Dialogue was in 2017. There are no plans presently for another civil space dialogue. Should a civil space dialogue be scheduled, the United States will announce at the appropriate time.

'We have and will continue to keep the lines of communication open with Beijing, including on issues of spaceflight safety.'

Sarah Noble, Artemis lunar science lead for NASA’s Planetary Science Division, said in a previous statement: ‘Several of the proposed sites within the regions are located among some of the oldest parts of the moon, and together with the permanently shadowed regions, provide the opportunity to learn about the history of the Moon through previously unstudied lunar materials.’

'In exploring the Moon, we will follow what we have spelled out in the Artemis Accords—that we will be transparent about all activities, operate in a safe and responsible manner, and avoid harmful interference,' NASA said

NASA officials have said they will narrow down their list about 18 months before Artemis 3 so they can prepare for potential landings at each site.

There has been a recent war of words between the two countries over space activities.

Last month, NASA administrator Bill Nelson told a German newspaper that China is planning to take over the moon.

'We must be very concerned that China is landing on the moon and saying: 'It's ours now and you stay out',' he said.

China expressed its displeasure quickly.

Zhao Lijian, a spokesman at the Chinese foreign ministry, said in a statement: 'This is not the first time that the head of the US National Aeronautics and Space Administration has ignored the facts and spoken irresponsibly about China.

'The US side has constantly constructed a smear campaign against China's normal and reasonable outer space endeavors, and China firmly opposes such irresponsible remarks.'

Christopher Newman, professor of space law and policy at Northumbria University in the United Kingdom, told SpaceNews that 'this is a genuine opportunity for collaboration and cooperation between the two giant powers, and would be an opportunity to show all the rhetoric about space exploration being more than geopolitical in nature.'

'However, in reality it is not hard to see why they both want the same spots. It is prime lunar real estate for in-situ resource utilization. This could be the first potential point of conflict over resources beyond Earth,' he added.

A recent article in Beijing's Global Times said: 'Space observers also pointed out that as NASA is trying hard to relive its Apollo glories, China is working on innovative plans to carry out its own crewed moon landing missions.'

{ https://www.dailymail.co.uk/ }

22-03-2023 om 22:58 geschreven door peter  

NASA’s Orion spacecraft will be the crew’s ride to and from Earth and into and out of lunar orbit. Orion is the only spacecraft capable of returning crews to Earth at lunar reentry velocities. On the successful Artemis I mission, Orion’s uniquely designed heat shield was recently tested under these extreme reentry conditions. Four astronauts will depart from Launch Pad 39B at Kennedy Space Center in Florida atop the Space Launch System (SLS), the only rocket powerful enough to send Orion, its crew, and their supplies to the Moon in a single launch. The crew will be selected from among the most diverse astronaut corps in history, each equipped with unique skills and intensively trained.

First the crew will launch to Earth orbit where they will perform systems checks and solar panel adjustments on Orion. Then, a powerful push from SLS’s interim cryogenic propulsion stage will help Orion perform a translunar injection maneuver, setting its course to the Moon.

For several days, the crew will travel toward the Moon and perform corrective engine burns to intercept the Moon’s gravitational field. At the right time and location, Orion will perform a series of two engine burns to place the spacecraft in a lunar Near-Rectilinear Halo Orbit (NRHO). From hundreds of potential orbits, NASA selected NRHO to achieve long-term Artemis goals. NRHO will provide near-constant communications with Earth and access to sites all over the Moon. Because it is gravitationally balanced between Earth and the Moon, this orbit will maximize fuel efficiency. On future missions, NASA and its partners will assemble the Gateway lunar space station in NRHO to serve as a hub for Artemis missions.

NASA has selected SpaceX to provide the human landing system that will transport Artemis III astronauts from Orion in lunar orbit to the surface of the Moon and back again. SpaceX plans to use a unique concept of operations to increase the overall efficiency of their lander. After a series of tests, SpaceX will fly at least one uncrewed demo mission that lands Starship on the lunar surface. When Starship has met all of NASA’s requirements and high standards for crew safety, it will be ready for its first Artemis mission.

Before the crew launch, SpaceX will launch a storage depot to Earth orbit. A series of reusable tankers will carry propellant to the storage depot to fuel the human landing system. The uncrewed Starship human landing system will then launch to Earth orbit and rendezvous with the storage depot to fill its tanks before executing a translunar injection engine burn and traveling approximately six days to NRHO where it will await the Artemis III crew.

When both spacecraft have arrived in NRHO, Orion will dock with the Starship human landing system in preparation for the first lunar surface expedition of the 21st century. Once the crew and their supplies are ready, two astronauts will board Starship and two will remain in Orion. Orion will undock and back away from Starship to remain in NRHO for roughly one orbit around the Moon, lasting about 6.5 days. This will match the length of the surface expedition, so as Orion completes its orbit, the two person surface crew will finish their work on the surface in time to launch back up to meet the spacecraft.

NASA has its sights set on locations around the South Pole for the Artemis era of human lunar exploration. Extreme, contrasting conditions make it a challenging location for Earthlings to land, live, and work, but the region’s unique characteristics hold promise for unprecedented deep space scientific discoveries. Using advanced technology including autonomous systems, the crew inside of Starship will land at a carefully selected site within a 100-meter radius.

On the Moon

After touchdown, the surface crew’s first task will be to ensure all systems are ready for their lunar surface stay. Then they will rest, eat, and recharge for the first full day of the expedition.

During their time on the Moon, the astronauts will do scientific work inside Starship and conduct a series of moonwalks, exiting Starship to explore the surface. The astronauts will don advanced spacesuits, exit through an airlock, and descend on Starship’s elevator. NASA has selected Axiom Space to provide the Artemis III surface suits and spacewalk systems. These suits will give the astronauts increased range of motion and flexibility to explore more of the landscape than on previous lunar missions.

During their moonwalks, the astronauts will take pictures and video, survey geology, retrieve samples, and collect other data to meet specific scientific objectives. The view from the lunar South Pole region will look very different from the photos taken on Apollo missions in the Moon’s equatorial region. The Sun will hover just above the horizon, casting long, dark shadows across the terrain, which the crew will explore using headlamps and navigational tools. The information and materials collected by Artemis III astronauts will increase our understanding of the mysterious South Pole region, the Moon, and our solar system.

Mission control teams on the ground will be in contact with the crew as they relay what they see, hear, and feel. Through mission coverage and the ability to send high quality images and video to the ground with advanced communication technology, they will be sharing a unique new human experience with the world.

On the journey home

When their surface expedition is complete, the two astronauts will lift off the surface of the Moon and head back to NRHO in Starship to reunite with their crewmates in Orion. After docking, the crew will spend up to five days in orbit, transferring samples between the vehicles and preparing for the journey back to Earth.

When they reach the optimal NRHO departure point, with all four astronauts back in Orion, they will undock and ignite Orion’s engines, slinging the spacecraft past the Moon, and allowing it to coast toward Earth. The crew will travel about 24,855 miles (about 40,000 kilometers) per hour during reentry into Earth’s atmosphere. Assisted by 11 parachutes, the spacecraft will splash down in the Pacific Ocean where it and the crew will be retrieved with support from the U.S. Coast Guard and U.S. Navy.

Artemis III will be one of the most complex undertakings of engineering and human ingenuity in the history of deep space exploration to date. The astronauts' observations, samples, and data collected will expand our understanding of our solar system and home planet, while inspiring the next generation.

This mission will usher in a future in which humans consistently access the Moon, and human planetary exploration missions are within reach. Each Artemis mission will increase our knowledge, refine our operations, and prove our technology as we prepare for the first human mission to Mars.

Artemis III Mission Map

• To learn more and get the latest updates, follow @NASAArtemis on Facebook, Instagram, and Twitter, and subscribe to the Artemis Blog.

{ https://www.nasa.gov/ }

22-03-2023 om 22:33 geschreven door peter  

Wolf-Rayet 124

Driven by powerful stellar winds, expanding shrouds of gas and dust frame hot, luminous star Wolf-Rayet 124 in this sharp infrared view. The eye-catching 6-spike star pattern is characteristic of stellar images made with the 18 hexagonal mirrors of the James Webb Space Telescope. About 15,000 light-years distant toward the pointed northern constellation Sagitta, WR 124 has over 30 times the mass of the Sun.

Produced in a brief and rarely spotted phase of massive star evolution in the Milky Way, this star's turbulent nebula is nearly 6 light-years across. It heralds WR 124's impending stellar death in a supernova explosion. Formed in the expanding nebula, dusty interstellar debris that survives the supernova will influence the formation of future generations of stars.

Image Credit: NASA, ESA, CSA, STScI, Webb ERO Production Team

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{ https://science.nasa.gov/ }

22-03-2023 om 21:41 geschreven door peter  

7 Amazing Ancient Technologies Too Advanced for Their Time (Video)

Throughout history, there have been many civilizations that have left their mark on the world through their impressive architectural feats, artistic creations, and innovative technologies. While some of these ancient technologies have been lost to time, others continue to mystify and amaze us today.

From the amazing machinery used to build the pyramids, to the advanced weaponry of ancient China and the invention of the Egyptian war chariot , there are countless examples of ancient technologies that were far ahead of their time. But how did these ancient civilizations manage to achieve such remarkable feats without the benefit of modern technology? Join us as we explore some of the most incredible ancient technologies that continue to inspire wonder and admiration today.

• Top image: Ancient Egyptian war chariot.
• Source: ratpack223 / Adobe Stock.

By Robbie Mitchell

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{ https://www.ancient-origins.net/ }

22-03-2023 om 21:03 geschreven door peter  

Glowing Object Near Aircraft Over Adelaide. South Australia, March 22, 2023, UFO Sighting News.

Date of sighting: March 22, 2023
Location of sighting: Adelaide, South Australia

 

This UFO was visible for only a few seconds, but the photographer was able to quickly snap a few shots for us. Here we see object in the upper left corner and the aircraft in the lower right. The UFO was so bright it almost looked like a cloud, but no cloud could move that fast or far from the camera in four seconds. The speed, the color and the fact its so close to the plane all indicate its a alien scout ship, data gathering for sending back to a home planet. This UFO is very bright and it is not a drone, but an actual piloted craft. 

Scott C. Waring - Taiwan 

 

Eyewitness states: 

On the 22-3-2023 at 11.17 am, I was photographing an airliner flying out of Adelaide South Australia, when an extremely bright object appeared in my view finder. The object appeared at the top of the view finder, coming in from the north-west, and descending rapidly to the bottom of the view finder heading east. It was visible for about four seconds

{ https://www.ufosightingsdaily.com/ }

22-03-2023 om 18:46 geschreven door peter  

Fighter jet followed by black cube over Texas, March 21, 2023, UFO Sighting News.

Date of sighting: March 21, 2023

Location of sighting: Texas, USA

Source: MUFON

 

Guys this is something big. This black craft has many sides, like a diamond of sorts, but black. The eyewitness said it seemed to have an aura, but it didn't come out on camera, however a screenshot quickly confirms that detail. A glowing aura is seen around the UFO above. This means its some sort of energy field from its propulsion. It was following an old military jet, maybe monitoring it, scanning and gathering data to send back to its homeworld. For many alien species, oxygen would be like us breathing propane gas, so they send probes to gather info to learn about us. 

Scott C. Waring - Taiwan 

 

Eyewitness states:

 F-111 fighter jet flew west to east over the house. I thought was strange, never see fighter jets in this area. Also I thought they were decommissioned. Seconds later a strange orb like object flew from the area the jet left to the north then turned west out of sight. My wife got me to film it with my iPhone. Zoomed in seems to have a glow about it looks almost like an octagon shaped ball. It seemed to fly fast then slow to almost a stop then turned west till out of view.

{ https://www.ufosightingsdaily.com/ }

22-03-2023 om 18:42 geschreven door peter  

Lights Flash And Shoot Off, Pennsylvania March 16, 2023, UFO Sighting News. Video. 

Date of sighting: March 16, 2023

Location of sighting: Pennsylvania, USA

 

The report didn't cite the city, but this glowing light was caught as a guy went onto the back deck having a smoke. The light flashed on and off several times and then suddenly shot off into the distance. The flashing is the UFOs powering up and there are two objects side by side shooting away. The UFOs may have come from an underground base about 5 miles below the surface and materialized in the sky above the neighborhood.

Scott C. Waring - Taiwan 

 

Eyewitness states: 

{ https://www.ufosightingsdaily.com/ }

22-03-2023 om 18:37 geschreven door peter  

On June 29, 2019 a deep ocean ROV (remotely operated vehicle) captured at a depth of 1789 meters a UFO/USO passing the ROV at high speed. 

This USO/UFO footage was filmed with a work class ROV at an ocean depth of 5870 Feet (1789 Meters) in the Gulf of Mexico. The USO was untethered and was operating at a depth that prevented any kind of remote operation. 

While the footage quality isn't excellent, ROV operators that have seen the footage have no idea what the object may have been but concluded that it is not organic. 

The USO demonstrated advanced AI operation, construction, and power management capabilities that are not known in the commercial ROV world. 

This footage is further proof that these USOs do exist and have been with us for as long as airborne UFOs have. We only need to recognize and understand this phenomenon whether they are of extraterrestrial origin or military. 

Timestamps Video: 

1. Context from an ROV Operator (00:30) 

2. USO Footage (12:00) 

3. USO Replay (12:40) 

4. USO Slow Motion (13:00)

  

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{ http://ufosightingshotspot.blogspot.com/ }

22-03-2023 om 18:13 geschreven door peter  

Unraveling the Texas UFO Puzzle: Fighter Jet and Glowing Octagonal Object

On the evening of March 21, 2023, a bizarre UFO sighting took place over the skies of Texas, leaving residents baffled and sparking curiosity across the nation. The witness, who managed to capture the event on video using his iPhone, reported seeing an F-111 fighter jet flying low over his house, followed by a strange orb-like object just seconds later.

The witness described the jet flying from west to east over his home, which he found peculiar, as fighter jets are not commonly seen in the area. Furthermore, he noted that F-111 fighter jets were decommissioned, adding another layer of mystery to the sighting.

Just moments after the jet’s appearance, the witness and his wife spotted a round object flying through the sky. Initially thought to be a balloon, the object seemed to have an octagonal shape and emitted a glowing aura. The UFO traveled from the area where the jet had disappeared, first heading north before making a sharp turn westward and vanishing from sight.

The video, shot on an iPhone, clearly shows the unidentified object moving at varying speeds. At times, the object appeared to be flying quickly, while at other moments, it seemed to slow down to an almost complete stop before changing direction.

The mysterious sighting has raised several questions, such as why an F-111 fighter jet, which is no longer in service, would be present in the area. Additionally, the erratic movements and glowing appearance of the unidentified object defy conventional explanations.

As of now, there has been no official comment from the military or aviation authorities on the incident. However, the video evidence and witness account have intrigued UFO enthusiasts and the general public alike, prompting further investigations into the event.

• Find out more UFO sightings from Texas at this tag!

As we await answers, the enigmatic UFO sighting over Texas serves as a reminder that there is still much to learn about our skies and the potential for unexplained phenomena. Whether the object turns out to be a military experiment, an advanced drone, or something more otherworldly, this incident has undoubtedly captured the imagination of people all around the world.

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{ https://www.latest-ufo-sightings.net/ }

22-03-2023 om 17:46 geschreven door peter  

How Metal Artists In India Are Keeping A 4,500-Year-Old Craft Alive (Video)

Despite the challenges, metal artists in India are working to keep the ancient craft of Dhokra art alive. This traditional craft involves the use of a non-ferrous metal, often brass or bronze, to create intricate and detailed sculptures. The process of creating Dhokra art, which has endured for over four millennia, involves a combination of wax casting and metal casting techniques, resulting in unique and one-of-a-kind pieces.

To ensure the survival of this craft, metal artists are working to adapt and evolve their techniques, while also educating younger generations about the art form. By incorporating modern technologies and experimenting with new materials, these artists are finding new ways to produce Dhokra art and keep the tradition alive for future generations to appreciate and enjoy.

• Top image: A bronze sculpture, representational.
• Source: DivineWorld / Adobe Stock

By Joanna Gillan

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{ https://www.ancient-origins.net/ }

22-03-2023 om 01:44 geschreven door peter  

15 of Ancient History’s Most Ingenious Siege Weapons (Video)

Warfare has been a constant throughout human history, and with it, the development of increasingly sophisticated weaponry to overcome defensive fortifications. The ancient world was no exception, and siege warfare was a common tactic used to conquer enemy cities and strongholds. To accomplish this, ancient armies employed an array of ingenious siege weapons that varied from simple battering rams to complex machines capable of launching projectiles with deadly accuracy.

From the ballista, a giant crossbow first used by the ancient Greeks, to the trebuchet, which could hurl projectiles weighing over 1,000kg with ease, our ancestors were no slouches when it came to creating devastating weaponry.  As technology advanced, so did the sophistication of these ancient siege weapons , with some armies even employing early forms of flamethrowers and chemical weapons. While the brutality of ancient siege warfare may seem barbaric by modern standards, the ingenuity and engineering prowess displayed in these ancient siege weapons are a testament to humanity's endless quest for innovation and advancement.

• Top image: Siege weapon in action.
• Source: Smulsky / Adobe Stock.

By Robbie Mitchell

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{ https://www.ancient-origins.net/ }

22-03-2023 om 01:25 geschreven door peter  

Zowat 3,3 tot 3,6 miljard mensen, voornamelijk in de armste landen, wonen momenteel al in een gebied dat zeer kwetsbaar is voor de klimaatverandering. Dat terwijl zij eigenlijk het minst hebben bijgedragen aan die opwarming.

{ https://www.hln.be/  }

22-03-2023 om 01:09 geschreven door peter  

Underwater UFO/USO Caught on Film | Deep Ocean ROV Footage

What do you think it is? Like, comment and subscribe for more deep water exploration footage.

Timestamps:

- Context from an ROV Operator (00:30)

- USO Footage (12:00)

- USO Replay (12:40)

- USO Slow Motion (13:00)

Overview:

This USO/UFO footage was filmed with a work class ROV at an ocean depth of 5870 Feet (1789 Meters) in the Gulf of Mexico. While the footage quality isn't excellent, ROV operators that have seen the footage have concluded that it is not organic. The USO was untethered and was operating at a depth that prevented any kind of remote operation. If it was of Russian or Chinese origin, the USO demonstrated advanced AI operation, construction, and power management capabilities that are not known in the commercial ROV world.

USOs have been sighted before by commercial ROV pilots, but this is the first footage (as far as we know) to ever see the light of day.

{ https://www.youtube.com/ }

21-03-2023 om 22:58 geschreven door peter  

Peruvian Archaeologists Uncover Two-faced Moche Men with Cosmic Connections

Painted on a pillar within a ceremonial hall, archaeologists have found a 1,400-year-old “two faced man”, with cosmic associations.

The Moche culture was a pre-Columbian civilization that thrived between 100 BC and 700 AD, farming and fishing, in the northern coastal region of Peru. Known for their exquisite pottery featuring animals, people, and scenes from everyday life, they were also skilled metalworkers and produced fine gold and silver jewelry.

Now, a team of archaeologists have discovered two 1,400-year-old murals depicting two-faced men within a ceremonial hall. According to a report in Live Science , the two-faced men might refer to sacrifice, and "cosmic realms".

Upper and lower men are visible here on the pillar. Archaeologist Gabriela Cervantes Quequezana examines the imagery of the painted pillar.

(Lisa Trever/ Panamarca)

Rediscovering Ancient Artisans

Two murals of two-faced men holding unusual treasures were unearthed by archaeologists in August 2022 at the 1,400-year-old archaeological site of Pañamarca. Located in Peru's lower Nepeña Valley province of Huari, in the Ancash region of coastal Peru, the site features a large complex of stone structures including a central plaza, several temples, and residential areas. The murals were drawn between 550 AD and 800 AD, at the height of the Moche people’s rule of northern coastal Peru.

READ ALSO

The archaeological work was conducted by the Archaeological Research Project (PIA) “ Paisajes Arqueológicos de Pañamarca ” which is collaboratively led by the international team of Jessica Ortiz Zevallos, Lisa Trever of Columbia University and Michele Koons of the Denver Museum of Nature & Science (DMNS).

Interpreting The Painted Pillar

The two murals both adorn the same pillar within a large ceremonial hall. One of the murals, located at the top of the pillar, features a man with two faces holding a feather fan in one hand, and in the other hand he holds a goblet with four hummingbirds drinking from it. The second two-faced man is painted on the lower aspect of the pillar and has a moving feather fan in one hand and a stick-like object in the other.

Two images of two-faced men have been discovered at the Moche site of Pañamarca, Peru. Left; The upper figure painted on the pillar holding a goblet feeding hummingbirds, and a feather fan. Right; the lower figure holding a fan and an unidentified stick-like object.  

(Lisa Trever/ Panamarca)

Both of the two-faced men are depicted with headdresses or crowns and wearing colorful clothing held tight with sizable belts. Lisa Trever is an associate professor of pre-Columbian art history and archaeology at Columbia University , who led the discovery team, and she told Live Science that the reason the Moche artists depicted these two men “is a mystery.”

Probing the Two-faced Men Mystery

Dr. Trever suspects that the ancient artists may have been “experimenting with how to show movement, and two narrative moments at once." Furthermore, the archaeologist suspects the two men “may be deities,” but she added that this is uncertain because most depictions of deities in Moche art have non-human aspects “like fangs, or the faces or tails or wings of various creatures.” But these two murals, even though they have two faces, “seem entirely human," Trever noted.

Since uncovering the first mural in 1958, archaeologists have been studying the ceremonial hall at Pañamarca, now for over 60 years. Putting the depictions of two headed men in context, other murals within the ceremonial hall depict a priestess, a serpent and a bat. And according to a statement by the team, despite six decades of study, much of the hall is still unexcavated and it is thought that many more murals are awaiting discovery.

Panoramas of the Moche complex under excavation at Pañamarca. 

(Aerial drone photography by J. Antonio Ochatoma Cabrera/ Panamarca)

Exploring Cosmic Connections

Trever said one of the interesting things about the hall is the unusual density of paintings within it. This means the team can only excavate selected aspects of the building each archaeological field season. Trever said the team still has a lot of questions about the architecture and its functions and that it's still unknown how the Moche used this ritual space.

What is known about the ceremonial hall, however, is that it was reserved for use only by priests. The narrow passages and interior spaces suggest ritual use, and that “it was not a public space." Trever added it was probably open to “the leaders or elders of the community at Pañamarca." Edward Swenson , director of the Archaeology Centre at the University of Toronto, told Live Science that the two-faced men might have represented “a mortal wearing a mask and thus impersonating or becoming one with [the] supernatural." Furthermore, a connection with the gods might also be indicated in the detail of the hummingbirds drinking from the goblet.

Picking From the Peruvian Pantheon

Swenson said he interprets the hummingbirds drinking from the cup as “a powerful invocation of the centrality of sacrifice in Moche worldview." He added that sacrifice served as “a critical mechanism to ensure the circulation of life-giving fluids between beings and cosmic realms."

Like the Inca of Peru, the Moche people worshipped a wide variety of gods and deities associated with nature, agriculture, and fertility. Their primary gods included “Ai-Apaec,” a god of sacrifice and warfare; the “Decapitator,” who was a god of death and the underworld; and the Moon Goddess, who was associated with fertility, childbirth, and the menstrual cycle. It might be the case that the hummingbird was regarded as a messenger of the gods, transferring sacrificed human souls to the other world/s.

• Top image: The two-faced Moche man figure painted on the lower part of the pillar. Two images of two-faced men have been discovered at the Moche site of Pañamarca, Peru.  
• Source: Lisa Trever/ Panamarca

By Ashley Cowie

{ https://www.ancient-origins.net/ }

21-03-2023 om 22:49 geschreven door peter  

Is Archaeology Getting it Wrong? ‘Ancient Stone Tools’ Accidentally Made by Modern Monkeys

Archaeologists from the Max Planck Institute for Evolutionary Anthropology have announced their discovery of stone fragments that closely resemble ancient stone tools made by prehistoric humans. What is notable is that these apparently worked stone objects were actually made unintentionally by old world monkeys living in the forests of Thailand. Does this have implications for stone flakes taken to be tools at ancient hominin sites?

These industrious monkeys were not trying to make cutting or scraping tools. Yet they still produced pieces of rock with sharp edges perfect for cutting and scraping, as a side effect of their use of larger chunks of rocks to crack open hard nuts and shellfish. Impressively sharp flakes are sometimes chipped off during this process, and incredibly enough these rock slices look and feel a lot like some objects that have been identified as ancient stone tools purposely made by ancient humans and by ancient human ancestors.

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Until now, it had been believed that hominins like Homo sapiens ( modern humans ) and Neanderthals were history’s only toolmakers. But the stunning results of this new study, which has just been published in Science Advances , call into question the identification of at least some ancient stone tools as human cutting or scraping objects.

This wouldn’t be the case for all of the tools identified , since many (if not most) ancient stone tools are found in archaeological contexts that show other indications of human settlement and activity. But isolated stone “tools” supposedly made by ancient toolmaking cultures may now require much more careful analysis than in the past, to be sure that they really are human artifacts.

Examples of sharp-edged flakes produced unintentionally by long-tailed macaques. (© Proffitt et al, 2023/ Science)

If Monkeys Can Make ‘Tools’ Too, what Are the Ramifications?

The animals studied in this research were long-tailed macaques living in Phang Nga National Park along Thailand’s southwestern peninsular coast. The clever macaques use heavy stones to break open nuts and shellfish, and over time these stones have a tendency to break into pieces after repeated use. Pieces of these stones can be found all over the park land, and many of them do indeed bear a remarkable resemblance to the sharpened stone tools recovered from various ancient archaeological sites in East Africa.

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“The ability to intentionally make sharp stone flakes is seen as a crucial point in the evolution of hominins, and understanding how and when this occurred is a huge question that is typically investigated through the study of past artifacts and fossils,” lead study author Tomos Proffitt stated in a Max Planck Institute for Evolutionary Anthropology press release .

“Our study shows that stone tool production is not unique to humans and our ancestors.”

Notably, this is not the first study that suggests some ancient stone tools could actually have been made by monkeys. A 2016 University of Oxford study published in the journal  Nature revealed that capuchin monkeys living in Brazil’s Serra de Capivara National Park frequently created rock flakes and chips that looked exactly like prehistoric stone tools (these primates use hard quartz and quartzite rock to break open stones that contain mineral dust they like to lick). The authors of that study noted similarities between the shapes of the capuchin “artifacts” and some of the simpler tools associated with the ancient Oldowan culture , which is alleged to have been manufacturing stone tools in East Africa more than two million years ago.

Did Humans Make the First Sharp-Edged Tools by Accident?

Naturally, a lot of the focus on this study will be on the doubts raised about past identifications of stone tools as man-made artifacts. But another important aspect of the research is what it suggests about how ancient humans started using sharp-edged tools in the first place.

Were the earliest modern humans, or human ancestors living millions of years ago, manufacturing all these tools themselves? Or did they start out by experimenting with sharp rock chips and flakes created when they were using larger rocks to break open difficult-to-access food sources?

“Cracking nuts using stone hammers and anvils, similar to what some primates do today, has been suggested by some as a possible precursor to intentional stone tool production,” said Lydia Luncz, the senior study author and the head of the Technological Primates Research Group at the Max Planck Institute. “This discovery shows how living primates can help researchers investigate the origin and evolution of tool use in our own lineage.”

Healthy Skepticism Means Better Science

In order to uncover accurate information about the origin of important cultural practices, archaeologists must interpret ancient artifacts properly and not misidentify natural objects as man-made. In this instance, the situation is interesting because the “natural forces” that can produce objects resembling human tools are still emerging from the intelligent actions of a primate species.

From now on there may be added uncertainty about whether relatively simple sharp-edged stone tools taken from ancient sites were really made by humans as cutting tools. To reach a definitive conclusion researchers will need to rely on more than the presence of sharp edges on stone flakes to identify them as man-made. Such identifications will now require added context to make them fully accepted, meaning they will need to be found mixed in with other man-made objects, collections of animal bones, or other remnants of past human activity that make it obvious that the stone objects were really tools and were being used as such.

In the long run this added scrutiny will be beneficial to the archaeological profession, as its research into prehistoric toolmaking practices will be carried out with a bit more healthy skepticism than was present before.

• Top image: Example of a long-tailed macaque using a stone tool to access food.  
• Source: © Lydia V. Luncz/ Science

By Nathan Falde

{ https://www.ancient-origins.net/ }

21-03-2023 om 22:10 geschreven door peter  

Is There More to the Mechanics of the Great Pyramid?

At the beginning of March, Egypt’s Ministry of Tourism & Antiquities (MOTA) announced a newly discovered chamber above the main (North) entrance to the Pyramid of Khufu, also known as the Great Pyramid of Giza, outside Cairo. This 9 meter by 2 meter chamber sits directly above the North entrance, and why it was included there currently remains unknown. Could it be part of a long since dismantled locking system?

Another cavity exists between the Grand Gallery and the King’s Chamber, and far more is known about this space, which has a 3 stone blocking mechanism. But it is still somewhat enigmatic. Here, with an analysis of what is known of the construction of the blocking mechanism of this Antechamber, a mystery of the whole of the pyramid’s design is explored.

Current Thinking on the Antechamber to the King’s Chamber

From the time of the early archaeologists, the Antechamber between the Grand Gallery and the King’s chamber of the Pyramid of Khufu has been supposed to be a blocking device with three granite blocks in a row. The empty sarcophagus in the King’s chamber, the majestic Grand Gallery leading to it and this elaborate closing device led everyone to accept blindly that this was Khufu’s burial chamber. Three blocks were obviously meant to seal this chamber off.

The blocking is assumed to have worked this way. Maragioglio & Rinaldi: L’archittura delle piramidi Menfiti, parte 4, tavole (tav. 8 detail).

The vertical protruding “ribs” on the east and west walls looks like guiding lines for blocks. Fair enough. But why three, when one bigger one would be sufficient? Is it symbolic?

This way of blocking the entrance is not used in other pyramids we know of. Cylindrical rollers over the blocks seem to have been used to lower them into sealing-off position. Accurately measured drawings of Maragioglio & Rinaldi show how the blocks, in their view, were simply held up temporarily by wooden logs. So, while others bashed the supporting logs away, the blocks were held back by workers holding ropes, and then slowly lowered into their closing position.

I have calculated the weight of one such stone block to be approximately 1.5 -2 tons, (1.2m x 1.2m x 0.5 m = approx.0.8 m ³ x 2.5 t (average weight of 1 m ³ granite) = approx. 2 t). So it would have taken the weight of 20-30 Egyptians weighing 70 kg each just to hold one block. They must have been standing in the Grand Gallery. But why have nice rollers above the blocks and then a sharp – not even rounded - edge on the corridor’s ceiling. It doesn’t seem well planned.

The ropes must have gone out under a sharp edge.

(Guardian's Egypt - Copyright © 1995-2014 Andrew Bayuk. All Rights Reserved/ Guardian.net)

And what about the open shaft in front of the closing blocks? If the blocks were supposed to be lowered by gradually slacking the ropes over the cylindrical rollers, it leaves this “pre-Antechamber” open to intruders afterwards, who would quickly realize that only the inner of the three blocks would have to be broken to gain access to the supposed burial chamber. Not very smart, though I admit that the damage to the southern wall (repaired) could suggest an attack from above.

But why use rollers at all?

This was a very complicated system for a one-time use. Ropes would easily slide over rounded edges of normally square blocks - the friction would even help the careful lowering, giving an argument against the roller idea - and with just narrow gaps or holes in the masonry, grave-robbers would have had a much harder job.

The rollers led me to conclude that they may have been familiar with pulley systems. Also, because I believe in Australian Paul Hai’s theory: that they rolled big stone blocks, even up the pyramid sides, with the help of convex wooden “sleighs” fastened to the blocks. Models of such sleighs or “rockers” are found.

Images from Paul Hai’s book, illustrating his wonderful idea. (Author provided)

Gods and Chambers

In an earlier article I have proposed that the closing system was designed to be used time after time and was made as a counterweight opening and closing system. It is the most logical reason for using rollers to eliminate friction.

The idea suits my basic theory that all the chambers in the pyramid were equally important.

I believe that each chamber honored one of the cosmological gods of the area. The Giza pyramids are only 30 km from Heliopolis. The five first listed gods there were gods for nature elements – earth, water (actually rain and mist = water moving vertically), and air, for some, and the three chambers we know were formed to suit one god’s element each. The gods in question were Geb, Tefnut and Shu respectfully.

And yes, I do believe that two other chambers existed: one on top of the pyramid honoring the sky goddess Nut, just covered by the pyramid’s casing stones until they fell off in an earthquake, which also loosened many of the casing stones from the sides; and a hidden chamber honoring the sun- and creator god Re-Atum. These five were the gods who had created the world.

Built vertically into the pyramid the chambers were steps on a ladder helping the deceased king ascend to heaven.

Khufu’s pyramid, including the two missing chambers higher up. I believe the chambers honored local element gods. (Author provided)

All the Chambers Display Symbolism

I believe that Khufu was buried in the subterranean chamber. The chamber was not unfinished and abandoned. This was the earth god Geb’s chamber, and a lot of the bedrock was left, intentionally giving the impression of a quarry. We can imagine how stone masonry was highly respected in ancient Egypt – a divine craft associated with Geb, I presume. Looking carefully you will see that there is a flat level area big enough to house a sarcophagus, wooden, assembled on the spot.

When the Greek historian Herodotus visited Egypt two thousand years after Khufu lived, priests told Herodotus that the king lay buried under the pyramid, on an island surrounded by water coming from an artificial canal.

With a wooden tube and some water, the words of Herodotus are brought to life in a symbolic tableau. (Author provided)

Now watch how much difference a little imagination can result in: All it takes to make us realize that Herodotus’ words may be a rather precise description of an incredible original tableau is a square wooden tube. Placed vertically in the well, with two sides resting on the cut-out ledge and tightened with clay or silt you would have a proper water well (it has been dug out deep enough to conclude that it reached ground water level at least in flooded periods).

Why have they dug the well so deep? Because they needed a lot of water. Pouring water onto the floor would result in a tableau like the one I have drawn. And more water was needed higher in the pyramid.

The Queen’s chamber and the Grand Gallery. Maragioglio tav. 7, partly cleaned for clarity. (Author provided)

Water in Tefnut’s (the Queen’s) chamber. (Author provided)

The Queen’s chamber and the Grand Gallery were wonderful gems too and call for attention, but they are only briefly referred to in this article. The Queen’s chamber had water on the floor and water in the closed canals.

Details reveal that the Grand Gallery is not my missing chamber for the sun god – the sloping Gallery is clearly not a chamber – and anyway his chamber should be closer to the sky/the top chamber. I have come to the conclusion that the Gallery is linked to the sun anyway, in the respect that it represents the sun’s rays, bringing warmth, light, heat, fire and life to the lower world. It represents the fire element on earth, whereas the sun god’s actual chamber is higher up.

Counterweight System Details

After a critical examination of the system I previously proposed for the opening and closing system: a wooden tube, balanced by a stone block in the first shaft, I have realized it was a hasty thought. A wooden tube, even three times the size of one blocking stone, would not balance the weight of a heavy stone counterweight. A wooden tube, even 20 cm (8 inches) thick and having a base area of approx. 1x2 meters – 2 square meters, would only weigh as much as 600 kg, having the average weight of e.g. cedar wood.

The remains of the counterweight stone from the shaft in front may very well be the broken stone block with drilled holes on display outside the pyramid’s entrance. From the looks of it (I haven’t measured) it is as thick as the other assumed stone blocks, therefore possibly weighing 1.5-2 tons.

The wooden tube idea. (Author provided)

I regret having to give up the wooden tube idea. The side walls’ ribs of stone would function as fine guides preventing the tube from getting stuck (from tilting forwards or backwards). I do realize that a tube could be made heavier by putting extra stones on top of it or inside the tube, but a whole extra ton?

Another counterweight possibility: a stone basin, closed and open.
The grill (see below) still waits for someone to pull the rope. (Author provided)

A Low Stone Basin

To balance a stone block, “the wooden tube” must instead have been made of stone. A basin almost formed as a sarcophagus, open in both ends, would work. With side wall thicknesses like the sarcophagus inside the chamber, which is c. 15 cm (6 inches), the side walls of a stone basin may have had about the height of the corridor, and contained some water.

Alternately the basin could have had rather low sides and a bottom thickness of about the half of the counterweight, c. 25 cm (because the vertical counterweight area is roughly half that of the floor area under the three rollers). The low side version is shown here, but higher sides would better prevent it from being stuck by tilting.

The vertical grooves with a grill.  The grooves continue all up to the ceiling. (Unknown photographer)

Grooves for ropes or a grill?

The interesting vertical grooves on the south wall, over the last bit of corridor leading to the King’s Chamber, could have given room for the ropes holding the inner block, in the popular three-block version. But why, in that case, were the grooves chiseled in all the way up to the ceiling? Even though the big wall stone with the most of the grooves ends a little below the ceiling, the grooves continue on another stone. That would not be necessary, if those grooves were for ropes around the roller.

The grooves could instead have guided a grill, blocking the entrance. It could be lifted with a rope going around the closest roller. It is the best use I can see for these grooves. The grill can be held close to the wall with a wooden beam or two, crossing from wall to wall. An explanation to why it should be there is proposed below.

Temple Functions

Rites were carried out in the grave temple outside the pyramid. Could the pyramid itself be a temple? The later roman writer Apuleius describes in his book The Golden Ass his own initiation into the Isis cult. He wrote that he came to the boundaries of death and then returned, going through all the elements . The Greeks had (re-) invented the elements by then, without gods, but his significant words about elements give meaning to speculations of whether Khufu’s pyramid with its element chambers functioned as an initiation temple as well as grave for a king.

In such a context the Ante-chamber’s layout is very interesting. Coming to this level the initiate would have descended to the bottom chamber, had seen the sarcophagus, had noticed the bedrock linking this chamber to the earth god Geb, had noticed the water seemingly floating in from the square canal on the opposite wall, and seen the hollow upper end of the wooden tube, seemingly a hole to the underworld. To him, this was the boundaries of death.

From here he went up, visited the Queen’s chamber (Tefnut’s watery element), and had passed through the stylized sun beams of the Grand Gallery. Now he stood on the landing in front of the last earthbound element’s chamber, the air god Shu’s chamber. He was the god who had lifted the sky from the earth and was still holding it up by his hands, standing on the earth.
The initiate found the entrance closed.

Natural vertical order of elements. Sky goddess Nut held up by air god Shu. Earth god Geb lying on the ground. The sun sailed below the sky. (Author provided)

A Test

Standing in front of a closed entrance must have felt like being tested. Now what? He should probably demonstrate that he mastered manipulation of the elements he had passed on his way.

One of the earth element’s most obvious powers is its weight. Could he overcome that?

The blocking stone didn’t rest perfectly on the floor. A one-centimeter gap gave him no other choice than to try to lift the stone by hands, if he wanted to enter Shu’s chamber. So he tried - and the block moved (due to the low-friction rollers)!

The next thing he saw was glowing and burning charcoal (or dried camel dung) in the next three to four meters (the floor is depressed here, and the air channels in the chamber conveniently ventilated out most of the smoke). Fire… how could he pass this fire without getting grave skin burns? Furthermore, a grill blocked his way, and a much larger stone block was coming down as he lifted the entrance door.

Lifting the door stone all the way up revealed that the descending stone was a stone basin, covering the first half of the burning path. The basin contained water.

Having stood in water in Tefnut’s chamber he would now rely on her help to extinguish (control) the fire in a narrow path. Having wet feet would also help him to a safe passage.

Just the grill remained. Either it had gone up automatically when he lowered the basin, or better, a dangling rope gave him the final opportunity to demonstrate decision and will to enter Shu’s chamber.

Maragioglio & Rinaldi, tav.4, detail. (Author provided)

In line with later initiation symbolism the sarcophagus in Shu’s chamber implies that the initiate now had to symbolically die by entering the sarcophagus and well, maybe die “the small dead”- go to sleep, or in another way open his mind to the afterlife : he was spoken to by heavenly voices, coming from somewhere (above the ceiling)! This was probably the reason for the narrow-dug tunnel leading from high over the Gallery landing into the lowest of the so-called weight-relieving chambers above the King’s chamber.

This finished his task – now he was reborn, having been dead, having been spoken to by gods.
Having realized that the elements and their chambers were steps in the pyramid’s stairway to heaven - he was now initiated.

And we are too, having understood and refurnished the Antechamber.

• Top image: Khufu pyramid from the northeast view.
• Source: dynamofoto/Adobe Stock

By Niels Bjerre Jorgensen

{ https://www.ancient-origins.net/ }

21-03-2023 om 21:30 geschreven door peter  

Unidentified Phenomenon Flies Over Italy: Possible UFO Sighting or Something Else?

In 2021, a video of strange lights in a triangular formation floating in the air above the horizon went viral on social media. Shot from a train in Italy, the footage shows three orange orbs glowing in the sky. Some viewers linked this light pattern to a typical triangular UFO, making claims that this was an alien spacecraft.

However, science writer Mick West disagrees, saying that the lights appear to move independently and gradually drift down, which is consistent with military flares. Despite the different opinions, experts cannot provide a conclusive explanation for the phenomenon.

The classic saucer-shaped UFOs of the 1950s and ’60s have become passé, and today, more and more sightings feature bright orbs, cylindrical objects, and even triangles. While this latest sighting remains a mystery, it adds to the growing list of unusual and unexplained phenomena in our skies.

If you’re intrigued by UFO sightings and want to know more about this phenomenon, stay tuned for the latest updates and research. Who knows what we might discover next?

{ https://www.latest-ufo-sightings.net/ }

21-03-2023 om 18:09 geschreven door peter  

Space dust as Earth’s sun shield

Dust launched from the moon’s surface or from a space station positioned between Earth and the sun could reduce enough solar radiation to mitigate the impacts of climate change.

Peer-Reviewed Publication

UNIVERSITY OF UTAH

iMAGE: SIMULATED STREAM OF DUST LAUNCHED BETWEEN EARTH AND THE SUN. THIS DUST CLOUD IS SHOWN AS IT CROSSES THE DISK OF THE SUN, VIEWED FROM EARTH. STREAMS LIKE THIS ONE, INCLUDING THOSE LAUNCHED FROM THE MOON’S SURFACE, CAN ACT AS A TEMPORARY SUNSHADE. view more 

CREDIT: BEN BROMLEY/UNIVERSITY OF UTAH

On a cold winter day, the warmth of the sun is welcome. Yet as humanity emits more and more greenhouse gases, the Earth'satmosphere traps more and more of the sun's energy and steadily increases the Earth's temperature. One strategy for reversing this trend is to intercept a fraction of sunlight before it reaches our planet. For decades, scientists have considered using screens, objects or dust particles to block just enough of the sun’s radiation—between 1 or 2%—to mitigate the effects of global warming.

A University of Utah-led study explored the potential of using dust to shield sunlight. They analyzed different properties of dust particles, quantities of dust and the orbits that would be best suited for shading Earth. The authors found that launching dustfrom Earth to a way station at the “Lagrange Point” between Earth and the sun (L1) would be most effective but would require astronomical cost and effort. An alternative is to use moondust. The authors argue that launching lunar dust from the moon instead could be a cheap and effective way to shade the Earth.

The team of astronomers applied a technique used to study planet formation around distant stars, their usual research focus. Planet formation is a messy process that kicks up lots ofastronomical dust that can form rings around the host star. These rings intercept light from the central star and re-radiate it in a way that we can detect it on Earth. One way to discover stars that are forming new planets is to look for these dusty rings.

“That was the seed of the idea; if we took a small amount of material and put it on a special orbit between the Earth and the sun and broke it up, we could block out a lot of sunlight with a little amount of mass,” said Ben Bromley, professor of physics and astronomy and lead author of the study.

"It is amazing to contemplate how moon dust—which took over four billion years to generate—might help slow the rise in Earth’s temperature, a problem that took us less than 300 years to produce,” said Scott Kenyon, co-author of the study from the Center for Astrophysics | Harvard & Smithsonian.

The paper was published on Wednesday, Feb. 8, 2023, in the journal PLOS Climate.

Casting a shadow

A shield’s overall effectiveness depends on its ability to sustain an orbit that casts a shadow on Earth. Sameer Khan, undergraduate student and the study’s co-author, led the initial exploration into which orbits could hold dust in position long enough to provide adequate shading. Khan’s work demonstrated the difficulty of keeping dust where you need it to be.

“Because we know the positions and masses of the major celestial bodies in our solar system, we can simply use the laws of gravity to track the position of a simulated sunshield over time for several different orbits,” said Khan.

Two scenarios were promising. In the first scenario, the authors positioned a space platform at the L1 Lagrange point, the closest point between Earth and the sun where the gravitational forces are balanced. Objects at Lagrange points tend to stay along a path between the two celestial bodies, which is why the James Webb Space Telescope (JWST) is located at L2, a Lagrange point on the opposite side of the Earth. 

In computer simulations, the researchers shot test particles along the L1 orbit, including the position of Earth, the sun, the moon, and other solar system planets, and tracked where the particles scattered. The authors found that when launched precisely, the dust would follow a path between Earth and the sun, effectively creating shade, at least for a while. Unlike the 13,000-pound JWST, the dust was easily blown off course by the solar winds, radiation, and gravity within the solar system. Any L1 platform would need to create an endless supply of new dust batches to blast into orbit every few days after the initial spray dissipates.

“It was rather difficult to get the shield to stay at L1 long enough to cast a meaningful shadow. This shouldn’t come as a surprise, though, since L1 is an unstable equilibrium point. Even the slightest deviation in the sunshield’s orbit can cause it to rapidly drift out of place, so our simulations had to be extremely precise,” Khan said. 

In the second scenario, the authors shot lunar dust from the surface of the moon towards the sun. They found that the inherent properties of lunar dust were just right to effectively work as a sun shield. The simulations tested how lunar dust scattered along various courses until they found excellent trajectories aimed toward L1 that served as an effective sun shield. These results are welcome news, because much less energy is needed to launch dust from the moon than from Earth. This is important because the amount of dust in a solar shield is large, comparable to the output of a big mining operation here on Earth.  Furthermore, the discovery of the new sun-shielding trajectories means delivering the lunar dust to a separate platform at L1 may not be necessary. 

Just a moonshot?

The authors stress that this study only explores the potential impact of this strategy, rather than evaluate whether these scenarios are logistically feasible.

“We aren’t experts in climate change, or the rocket science needed to move mass from one place to the other. We’re just exploring different kinds of dust on a variety of orbits to see how effective this approach might be. We do not want to miss a game changer for such a critical problem,” said Bromley.  

One of the biggest logistical challenges—replenishing dust streams every few days—also has an advantage. Eventually, the sun’s radiation disperses the dust particles throughout the solar system; the sun shield is temporary and shield particles do not fall onto Earth. The authors assure that their approach would not create a permanently cold, uninhabitable planet, as in the science fiction story, “Snowpiercer.”

“Our strategy could be an option in addressing climate change,” said Bromley, “if what we need is more time.” 

{ https://www.eurekalert.org/ }

21-03-2023 om 01:36 geschreven door peter  

Stof lanceren vanaf de maan om zonlicht tegen te houden, het klinkt als toekomstmuziek, maar de mogelijkheid komt dichterbij en het zou zomaar eens serieus kunnen helpen om de opwarming van de Aarde tegen te gaan.

Het lijkt namelijk nu veilig en technisch mogelijk om zo’n zonnescherm te creëren tussen de Aarde en de zon. Daarvoor moet dan wel om de paar dagen stof worden afgeschoten vanaf de maan. Zo bereikt minder zonlicht de Aarde, waardoor de planeet afkoelt.

Minder zonlicht op aarde
Het is een futuristisch plan waar al langer in verschillende vormen over wordt nagedacht: een kunstmatige barrière opwerpen tussen de zon en de aarde om klimaatverandering tegen te gaan. In het boek SuperFreakonomics uit 2009 staat bijvoorbeeld al een hoofdstuk over de mogelijkheid om zwaveldioxide (SO2) in de stratosfeer te schieten om de aarde tijdelijk af te koelen. De schrijvers baseren zich hierbij onder andere op de enorme uitbarsting in 1883 van de Krakatau-vulkaan in Indonesië, waarbij 20 miljoen ton SO2 vrijkwam. De wereld was toen vijf jaar lang enkele graden kouder dan normaal, omdat minder zonlicht het aardoppervlak bereikte. Maar critici schoten dit wilde plan vrijwel direct af.

Lagrange Points
Maar het idee bleef bestaan. Wetenschappers van de University of Utah gaan nu nog een stap verder en hebben verschillende scenario’s doorgerekend voor een haalbare strategie om zonlicht tegen te houden. Ze overwogen om satellietschermen te plaatsen of andere objecten of stofdeeltjes buiten onze dampkring te brengen. Uiteindelijk kwamen ze tot de conclusie dat de meest efficiënte manier om een of twee procent van het zonlicht te blokkeren – dat is al genoeg om de huidige klimaatopwarming teniet te doen – is om stofdeeltjes te lanceren vanaf de maan. Voor een optimale werking moet het stofspoor precies naar het Lagrange Point worden geschoten. Er zijn twee Lagrange Points rondom de aarde. L1 is het dichtstbijzijnde punt tussen de aarde en de zon waar de zwaartekrachten in evenwicht zijn. De James Webb-ruimtetelescoop bevindt zich op L2, een Lagrange-punt aan de andere kant van de aarde.

“De basis van ons idee is om een beperkte hoeveelheid materiaal te gebruiken om in een speciale baan tussen de aarde en de zon te plaatsen en daar uit elkaar te laten vallen. Op deze manier kunnen we veel zonlicht blokkeren met een kleine hoeveelheid massa”, vertelt hoogleraar natuurkunde en astronomie Ben Bromley tegen Scientias.nl. “Ons onderzoek richtte zich hoofdzakelijk op de conceptvraag. Ik kan alleen maar gissen naar de tijd en de kosten die zo’n gigantisch ruimteproject met zich meebrengen. Het zal in ieder geval een astronomisch bedrag zijn, maar vergeet niet dat de gevolgen van klimaatopwarming ook een enorm kostenplaatje hebben.”

Kan maanstof de opwarming van de aarde helpen tegenhouden? Niet aan beginnen, denkt menig wetenschapper. 

 © HUM Images/Universal Images Group

Stofkanon op de maan
Het is een fascinerend idee om vier miljard jaar oud maanstof te gebruiken om de door de mens in tweehonderd jaar veroorzaakte klimaatopwarming tegen te gaan. Het ruimtegruis werkt in de berekeningen korte tijd heel goed, maar wordt dan al snel uit koers geblazen door de zonnewinden, straling en zwaartekracht in ons zonnestelsel. Elke paar dagen is er een nieuwe lading stof nodig om richting het Lagrange Point te schieten en aangezien het enorm veel kracht kost om het stof iedere keer vanaf de Aarde te lanceren, vanwege de zwaartekracht en de atmosfeer, is het volgens de onderzoeker een beter idee om dit vanaf de maan te gaan doen, ook al moet er daar dan eerst een basis worden gebouwd.

Niet te zien
Veel zullen mensen er op het eerste gezicht niet van merken, verwacht Bromley. “Aangezien de stofdeeltjes maar een fractie van het zonlicht tegenhouden, is het verschil vanaf de Aarde met het blote oog nauwelijks te zien. De stofdeeltjes verspreiden zich over de volle breedte van de zonneschijf.” Maar wat gebeurt er eigenlijk met het stofspoor nadat het uit elkaar is gevallen? Gaan we daar in de toekomst geen last mee krijgen? “We weten dat de deeltjes in ieder geval niet neervallen op aarde, op de maan of op onze satellieten. Maar het is onduidelijk of het gruis in de toekomst nog schade kan berokkenen bij ruimtereizen of iets dergelijks. Mocht dit concept echt worden uitgevoerd, dan zal eerst extra onderzoek hiernaar nodig zijn”, legt Bromley uit.

Astronomische parasol
Er zijn ook scenario’s doorgerekend, waarbij een meer permanente barrière wordt gevormd. “Sterrenkundige J. Roger Angel kwam met het idee om een vloot met een heleboel kleine bestuurbare satellieten in te zetten. Het probleem is dat bij Lagrange Point 1 het gebied dat je moet bestrijken erg groot is. Het gaat hier om een vlak van honderden bij honderden kilometers”, aldus de professor.

Bromley ziet zijn plan als een noodoplossing. “We zijn geen experts in klimaatverandering of de raketwetenschap die nodig is om massa van de ene plaats naar de andere te verplaatsen, maar we hebben wel onderzocht hoe verschillende soorten stof het zonlicht kunnen tegenhouden op verschillende plekken in ons zonnestelsel. Verder maken we de effectiviteit van deze aanpak overzichtelijk. Het zou doodzonde zijn om een alternatieve oplossing als deze voor het enorme klimaatprobleem op aarde niet door te rekenen. Onze strategie zou een optie kunnen zijn om tijd te kopen in de race tegen de klok, nu de tekenen van de destructieve klimaatverandering steeds duidelijker worden.”

Minder uitstoot
Maar ook de professor vindt dat in de eerste plaats de CO2-uitstoot omlaag moet. “Ons concept is een interessant onderdeel van een groter internationaal plan om klimaatverandering tegen te gaan. De belangrijkste stap is echter om de oorzaken van de opwarming van de aarde aan te pakken en de hoeveelheid broeikasgassen in onze eigen atmosfeer drastisch te verminderen”, besluit Bromley.

Bronmateriaal

• "In an astro-engineering approach to climate change mitigation, researchers calculate how dust could be fired from the Moon into space to attentuate the Sun's rays" - PLOS Climate
  Interview met professor Ben Bromley van de University of Utah
• Afbeelding bovenaan dit artikel: Shaman1006 / Getty (via Canva.com)

{ https://scientias.nl/ }

21-03-2023 om 01:20 geschreven door peter  

Graphic depiction of Bend-Forming of Large Electrostatically Actuated Space Structures.

Credit: Zachary Cordero

MATT WILLIAMS

Their proposed telescope addresses a key issue with space telescopes and other large payloads that are packaged for launch and then deployed in orbit. In short, size and surface precision tradeoffs limit the diameter of deployable space telescopes to the 10s of meters. Consider the recently-launched James Webb Space Telescope (JWST), the largest and most powerful telescope ever sent to space. To fit into its payload fairing (atop an Ariane 5 rocket), the telescope was designed so that it could be folded into a more compact form.

This included its primary mirror, secondary mirror, and sunshield, which all unfolded once the space telescope was in orbit. Meanwhile, the primary mirror (the most complex and powerful ever deployed) measures 6.5 meters (21 feet) in diameter. Its successor, the Large UV/Optical/IR Surveyor (LUVOIR), will have a similar folding assembly and a primary mirror measuring 8 to 15 meters (26.5 to 49 feet) in diameter – depending on the selected design (LUVOIR-A or -B). As Bhundiya explained to Universe Today via email:

“Today, most spacecraft antennas are deployed in orbit (e.g., Northrop Grumman’s Astromesh antenna) and have been optimized to achieve high performance and gain. However, they have limitations: 1) They are passive deployable systems. I.e. once you deploy them you cannot adaptively change the shape of the antenna. 2) They become difficult to slew as their size increases. 3) They exhibit a tradeoff between diameter and precision. I.e. their precision decreases as their size increases, which is a challenge for achieving astronomy and sensing applications that require both large diameters and high precision (e.g. JWST).”

While many in-space construction methods have been proposed to overcome these limitations, detailed analyses of their performance for building precision structures (like large-diameter reflectors) are lacking. For the sake of their proposal, Cordero and his colleagues conducted a quantitative, system-level comparison of materials and processes for in-space manufacturing. Ultimately, they determined that this limitation could be overcome using advanced materials and a novel in-space manufacturing method called Bend-Forming.

This technique, invented by researchers at the AMSL and described in a recent paper co-authored by Bhundiya and Cordero, relies on a combination of Computer Numerical Control (CNC) deformation processing and hierarchical high-performance materials. As Harsh explained it:

“Bend-Forming is a process for fabricating 3D wireframe structures from metal wire feedstock. It works by bending a single strand of wire at specific nodes and with specific angles, and adding joints to the nodes to make a stiff structure. So to fabricate a given structure, you convert it into bending instructions which can be implemented on a machine like a CNC wire bender to fabricate it from a single strand of feedstock. The key application of Bend-Forming is to manufacture the support structure for a large antenna on orbit. The process is well-suited for this application because it is low-power, can fabricate structures with high compaction ratios, and has essentially no size limit.”

In contrast to other in-space assembly and manufacturing approaches, Bend-Forming is low-power and is uniquely enabled by the extremely low-temperature environment of space. In addition, this technique enables smart structures that leverage multifunctional materials to achieve new combinations of size, mass, stiffness, and precision. Additionally, the resulting smart structures leverage multifunctional materials to achieve unprecedented combinations of size, mass, stiffness, and precision, breaking the design paradigms that limit conventional truss or tension-aligned space structures.

In addition to their native precision, Large Bend-Formed structures can use their electrostatic actuators to contour a reflector surface with sub-millimeter precision. This, said Harsh, will increase the precision of their fabricated antenna in orbit:

“The method of active control is called electrostatic actuation and uses forces generated by electrostatic attraction to precisely shape a metallic mesh into a curved shape which acts as the antenna reflector. We do this by applying a voltage between the mesh and a ‘command surface’ which consists of the Bend-Formed support structure and deployable electrodes. By adjusting this voltage, we can precisely shape the reflector surface and achieve a high-gain, parabolic antenna.”

An arrangement of 3 exoplanets to explore how the atmospheres can look different based on the chemistry present and incoming flux. Credit: Jack H. Madden used with permission

Harsh and his colleagues deduce that this technique will allow for a deployable mirror measuring more than 100 meters (328 ft) in diameter that could achieve a surface precision of 100 m/m and a specific area of more than 10 m²/kg. This capability would surpass existing microwave radiometry technology and could lead to significant improvements in storm forecasts and an improved understanding of atmospheric processes like the hydrologic cycle. This would have significant implications for Earth Observation and exoplanet studies.

The team recently demonstrated a 1-meter (3.3 ft) prototype of an electrostatically-actuated reflector with a Bend-Formed support structure at the 2023 American Institute of Aeronautics and Astronautics (AIAA) SciTech Conference, which ran from January 23rd to 27th in National Harbor, Maryland. With this Phase I NIAC grant, the team plans to mature the technology with the ultimate aim of creating a microwave radiometry reflector.

Looking ahead, the team plans to investigate how Bend-Forming can be used in geostationary orbit (GEO) to create a microwave radiometry reflector with a 15km (9.3 mi) field of view, a ground resolution of 35km (21.75 mi) and a proposed frequency span of 50 to 56 GHz – the super-high and extremely-high frequent range (SHF/EHF). This will enable the telescope to retrieve temperature profiles from exoplanet atmospheres, a key characteristic allowing astrobiologists to measure habitability.

“Our goal with the NIAC now is to work towards implementing our technology of Bend-Forming and electrostatic actuation in space,” said Harsh. “We envision fabricating 100-m diameter antennas in geostationary orbit with have Bend-Formed support structure and electrostatically-actuated reflector surfaces. These antennas will enable a new generation of spacecraft with increased sensing, communication, and power capabilities.”

Further Reading: 

• NASA

{  https://www.universetoday.com/ }

20-03-2023 om 23:54 geschreven door peter