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Boom! A Cosmic Impact On Our History?
Quote:12,800 years ago. The Younger Dryas Impact Hypothesis 
DOI: 10.1038/s41598-019-51552-8


1,500 years after the event... Split_spawn temples (re-) Sheep emerge?


Quote:“According to analysis, the temple has four steles. We think it's about 11,300 years old,”





11,000-year-old ancient temple found in eastern Turkey
Dating from Neolithic period, temple is similar to Göbeklitepe, oldest temple in the world, says archaeologist
[Image: 108x113resized_661a8-dbbfsiluetcircle.png]News Service14:02 October 31, 2019AA
[/url][url=http://thehiddenmission.com/forum/javascript:;]

[Image: resized_c925e-1653_eng_picture_20191030_...810001.jpg]

An ancient temple estimated to be over 11,000 years old has been found in eastern Turkey.
The temple dating from the Neolithic period with four monuments (steles) was unearthed in Dargecit in Mardin, an area known to have been home throughout history to Sumerians, Akkadians, Babylonians, Hittites, Assyrians, Romans, Seljuks, and Ottomans, among others.
Ergul Kodas, an archaeologist at Artuklu University and advisor to the excavation area, told Anadolu Agency that the temple, built with small stones and hardened clay floors, belongs to the same period as Gobeklitepe, the famed “oldest temple in the world.”


[Image: resized_678ce-1653_eng_picture_20191030_...809997.jpg]



AA


Gobeklitepe, declared an official UNESCO World Heritage Site last year, was discovered in 1963 by researchers from the universities of Istanbul and Chicago.
“According to analysis, the temple has four steles. We think it's about 11,300 years old,” said Kodas.
“Excavations are underway, but we have clearly revealed the steles. One of the four steles we uncovered was broken, but the other three were still preserved to this day as they were,” he added.
No figures were found on the steles, Kodas said, adding “This 80-square-meter temple of the Neolithic period has characteristics similar to Gobeklitepe.”

https://www.yenisafak.com/en/news/11000-...ey-3504172


[Image: resized_ec4ce-f36a9a2564f.jpg]
https://www.yenisafak.com/en/news/worlds...rs-3483263
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With a forked tongue the snake singsss...
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from EAa's last post

Quote:“According to analysis, the temple has four steles. 
We think it's about 11,300 years old,” said Kodas.
“Excavations are underway, but we have clearly revealed the steles. 
One of the four steles we uncovered was broken, 
but the other three were still preserved to this day as they were,” he added.
No figures were found on the steles,



no "figures" on the stele ... was there anything at all on them?


https://www.ancient-origins.net/history/...ng-0012754

Pillar 43, aka the ‘Vulture Stone’, 
at Göbekli Tepe is especially important, 
as it reveals a forgotten astronomical code that opens a window into the minds of ancient people, 
going back perhaps over 40,000 years. 
A code that allows one to read about catastrophic events, like the Younger Dryas impact,



http://www.andrewcollins.com/page/articl...tarius.htm
GÖBEKLI TEPE'S VULTURE STONE: 
A WARNING ACROSS TIME OR SIGNPOST TO THE LAND OF THE DEAD?
PUTTING INTO PERSPECTIVE THE CARVED IMAGERY ON GÖBEKLI TEPE'S PILLAR 43 IN ENCLOSURE

[Image: fig.%2010%20-%20vulture%20sone%20Pillar%...marked.jpg]



Pilar 43 The Pre-Historic Rosetta Stone
Pillar 43 is like a pre-historic Rosetta Stone. It shows that the people who constructed Göbekli Tepe were, among other things, astronomers who understood how the position of the stars changed very slowly over many millennia, a process called ‘precession of the equinoxes’. Conventionally, Hipparchus of ancient Greece is credited with this discovery in the second century BC. Furthermore, the people of Göbekli Tepe used their astronomical knowledge to encode a date, very likely the date of the Younger Dryas impact, on the pillar. Essentially, Pillar 43 can be interpreted as a memorial to this catastrophic event which potentially sparked the origin of civilisation itself.


...
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Quote:Posted by EA - Sunday, November 3rd, 2019, 05:38 pm

Quote: Wrote:12,800 years ago. The Younger Dryas Impact Hypothesis 
DOI: 10.1038/s41598-019-51552-8


1,500 years after the event... [Image: split_spawn.gif] temples (re-) [Image: sheep.gif] emerge?


Quote: Wrote:“According to analysis, the temple has four steles. We think it's about 11,300 years old,”





11,000-year-old ancient temple found in eastern Turkey
Dating from Neolithic period, temple is similar to Göbeklitepe, oldest temple in the world, says archaeologist



Holycowsmile SH*T!  Arrow


Quote:1,000 years after the event... [Image: split_spawn.gif] shitters (re-)  Horsepoop  emerge?
an 11,800-year-old sewer system at the ancient settlement of Boncuklu Tarla East in southeastern Turkey.
12,800 years ago. The Younger Dryas Impact Hypothesis 

DOI: 10.1038/s41598-019-51552-8


Sanitation keeps an (re-)advanced culture clean and healthy.  Tp

Neolithic Sewer System Uncovered in Southeastern Turkey



Friday, November 8, 2019
MARDIN, TURKEY—[i]The Anadolu Agency[/i] reports that an excavation team under the direction of archaeologist Ergül Kodaş of Artuklu University has found evidence of an 11,800-year-old sewer system at the ancient settlement of Boncuklu Tarla East in southeastern Turkey. “We were only able to unearth a certain portion of the sewer system, and confirmed it was in a public use area,” Kodas said. The team has also uncovered traces of buildings thought to have stood about 23 feet tall. An 11,300-year-old building was also found at the site recently. To read about the sudden destruction of a Bronze Age settlement in southeastern Turkey, go to "The Wrath of the Hittites."


https://www.archaeology.org/news/8171-19...wer-system
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Quote:11,800-year-old sewer system at the ancient settlement of Boncuklu Tarla East in southeastern Turkey

12,800 years ago Younger Dryas Impact Hypothesus


I would say two things,
that the area in and around Turkey was probably the least impacted by the global changes,
stimulated by the comet impacts,
and that sewer architectures were used in civilization centers prior to the impact.
As such, the recovery in least impacted global population centers was probably pretty quick.
...
Reply
MYSTERIOUS 'LARGE FIREBALL FALLING TO EARTH' CRASHES IN SALEM, POLICE INVESTIGATE
BY [b]SOO KIM [/b]ON 11/22/19 AT 7:13 AM EST



00:15
Fireball Hits Cuba With Huge Sonic Boom, Leaving Smoke Trail
[color=rgba(12, 11, 11, 0.8)]SHARE
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NEWSFIREBALLMETEORSASTRONOMYEARTH
Police are investigating a mysterious "large fireball falling to the earth" spotted in Salem, Oregon, in the southwest of Polk County.
The fiery trail was reported by a local resident around 4:50 p.m. (local time) on Thursday, according to Lt. Dustin Newman, a spokesman for the Polk County Sheriff's Office (PCSO), the Statesman Journal reports.
The incident was reported as a plane crash but its exact location remains undetermined, according to the PCSO, which posted images of the sighting on its official Facebook page.
"PCSO is currently investigating a large fireball falling to the earth in the southwest area of Polk County. The fireball was reported as a plane crash and PCSO is working to locate a possible landing location and exactly what the fireball is," the PCSO said on its official Facebook page.
"After the 911 call came we were able to get a helicopter in the area (as it is pretty remote) and they didn't see anything of concern. There were no reports of downed aircraft either. We really believe it was a meteor as yesterday there was a somewhat rare meteor shower in our area as well," Sheriff Mark Garton from the PCSO told Newsweek.
"The exact location of the fireball is unknown. PCSO will utilize aircraft during daylight hours tomorrow [Friday] in an attempt to cover the rough terrain in the area and wrap up the search. PCSO has utilized all available aviation tracking systems and no planes have been lost," the PCSO said on Facebook.

Fireball Streaks Across Night Sky Above St. Louis As Meteor Shower Peaks

READ MORE

The Federal Aviation Administration has yet to report any plane crashes in the area, while several national and local authorities, including the U.S. Forest Service, a Life Flight Network helicopter and a local timber company, are working together to determine the origin of the fireball, Newman confirms, the [url=https://eu.statesmanjournal.com/story/news/2019/11/21/deputies-investigating-large-fireball-fell-polk-county/4266933002/]Salem Statesman Journal reports.
The American Meteor Society (AMS) and NASA's Center for Near Earth Object Studies (CNEOS) have also yet to report fireballs in the area.
Speculation over the origins of the latest sighting has been building, with several theories posted on social media, ranging from it being a meteoroid or jet trail to a missile.
"I'm thinking it's the light from the sunset reflecting off a cloud or jet trail," noted user Sarah Werner, which could be a possibility, according to the AMS.
"The AMS and its international partners receive an average of 20,000 fireball reports every year. For the vast majority, these reports come from people who don't have any knowledge about meteors or general astronomy. As a result, we regularly receive reports that aren't related to fireballs or meteors but rather to the sun reflecting on contrails (short for 'condensation trails,')" the AMS notes on its official website.
"Contrails are the linear clouds etched across the skies by high-altitude airplanes. At sunset and sunrise, the sun light often gives warm tones (red, orange and yellow) that some people may mistake for an astronomical event," it adds.
"I wonder if it's a meteoroid we're supposed to have a shower tonight [Thursday]," wrote user Cheyanne Cody on the PCSO Facebook page.
"It looks like space junk, I've seen it before usually a big ball of fire with a purple tail," another user Elizabeth Yon commented, which could be another possibility.
Back in July, a large fireball was spotted shooting across the South Florida sky, which was reported to be space debris by the AMS, WPTV West Palm Beach reported.
[img=696x0]https://d.newsweek.com/en/full/1547974/spacex-southern-california-contrail-2018.jpg?w=737&f=a471879560f463f3bb264b2e86a83139[/img]

A SpaceX Falcon 9 rocket launched lights up the Southern California sky on January 22, 2018, with the sun light hitting the contrail left behind as a Spanish Paz satellite was placed into orbit.GETTY IMAGES
"Hey Polk Co. Sheriff, We saw it from our house in Estacada. My wife made a comment that it looked like a missile launch. Our house is at 2000ft in the foot hills," wrote user Tami Bailey.
"Fireballs and bolides are astronomical terms for exceptionally bright meteors that are spectacular enough to be seen over a very wide area," notes the CNEOS.
"Fireballs are very impressive and beautiful. They look like a huge (sometimes gigantic) shooting star," notes the AMS. "If you had enough time to grab your phone to take a picture, it is certainly NOT a fireball. Fireballs usually only last few seconds. Longer fireballs are extremely rare."
If there were clouds above the sighting, "it is certainly NOT a fireball (meteoroids glow usually as soon as they hit Earth's atmosphere and they entirely burn up between 60 miles – 100 km and 40 miles – 70km – the highest clouds can be found at 8 miles above the Earth' surface)," according to the AMS.
Newsweek has contacted the AMS and CNEOS for a comment and further insight on the fireball sighting in Oregon.
[img=696x0]https://d.newsweek.com/en/full/1547967/meteorite-death-valley-california-august-2019.jpg?w=737&f=d76901dbac44a28a23880089ff2dc307[/img]

View of meteorite streaking over Trona Pinnacles near Death Valley, CA during annual Perseid Meteor Showers on August 2, 2019. Police believe the latest fireball reported in Oregon could be linked to this week's meteor shower.GETTY IMAGES
The latest incident is not the only fireball sighting in recent weeks. Earlier this month, one was also reported in Missouri, according to an official report by the AMS.
"The AMS has received over 300 reports so far about of a bright fireball seen above Missouri on Monday, November 11th 2019 around 8:52pm (Nov. 12th 02:54 Universal Time). The event was mainly seen from the Missouri but we also received reports from Indiana, Illinois, Kansas, Minnesota, Nevada, Nebraska, Oklahoma and Wisconsin," the AMS reports.



https://www.newsweek.com/mysterious-larg...ng-1473469
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With a forked tongue the snake singsss...
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MYSTERIOUS 'LARGE FIREBALL FALLING TO EARTH' CRASHES IN SALEM, POLICE INVESTIGATE
BY [b]SOO KIM [/b]ON 11/22/19 AT 7:13 AM EST



00:15
Fireball Hits Cuba With Huge Sonic Boom, Leaving Smoke Trail
[color=rgba(12, 11, 11, 0.8)]SHARE
[/color]
NEWSFIREBALLMETEORSASTRONOMYEARTH
Police are investigating a mysterious "large fireball falling to the earth" spotted in Salem, Oregon, in the southwest of Polk County.
The fiery trail was reported by a local resident around 4:50 p.m. (local time) on Thursday, according to Lt. Dustin Newman, a spokesman for the Polk County Sheriff's Office (PCSO), the Statesman Journal reports.
The incident was reported as a plane crash but its exact location remains undetermined, according to the PCSO, which posted images of the sighting on its official Facebook page.
"PCSO is currently investigating a large fireball falling to the earth in the southwest area of Polk County. The fireball was reported as a plane crash and PCSO is working to locate a possible landing location and exactly what the fireball is," the PCSO said on its official Facebook page.
"After the 911 call came we were able to get a helicopter in the area (as it is pretty remote) and they didn't see anything of concern. There were no reports of downed aircraft either. We really believe it was a meteor as yesterday there was a somewhat rare meteor shower in our area as well," Sheriff Mark Garton from the PCSO told Newsweek.
"The exact location of the fireball is unknown. PCSO will utilize aircraft during daylight hours tomorrow [Friday] in an attempt to cover the rough terrain in the area and wrap up the search. PCSO has utilized all available aviation tracking systems and no planes have been lost," the PCSO said on Facebook.

Fireball Streaks Across Night Sky Above St. Louis As Meteor Shower Peaks

READ MORE

The Federal Aviation Administration has yet to report any plane crashes in the area, while several national and local authorities, including the U.S. Forest Service, a Life Flight Network helicopter and a local timber company, are working together to determine the origin of the fireball, Newman confirms, the [url=https://eu.statesmanjournal.com/story/news/2019/11/21/deputies-investigating-large-fireball-fell-polk-county/4266933002/]Salem Statesman Journal reports.
The American Meteor Society (AMS) and NASA's Center for Near Earth Object Studies (CNEOS) have also yet to report fireballs in the area.
Speculation over the origins of the latest sighting has been building, with several theories posted on social media, ranging from it being a meteoroid or jet trail to a missile.
"I'm thinking it's the light from the sunset reflecting off a cloud or jet trail," noted user Sarah Werner, which could be a possibility, according to the AMS.
"The AMS and its international partners receive an average of 20,000 fireball reports every year. For the vast majority, these reports come from people who don't have any knowledge about meteors or general astronomy. As a result, we regularly receive reports that aren't related to fireballs or meteors but rather to the sun reflecting on contrails (short for 'condensation trails,')" the AMS notes on its official website.
"Contrails are the linear clouds etched across the skies by high-altitude airplanes. At sunset and sunrise, the sun light often gives warm tones (red, orange and yellow) that some people may mistake for an astronomical event," it adds.
"I wonder if it's a meteoroid we're supposed to have a shower tonight [Thursday]," wrote user Cheyanne Cody on the PCSO Facebook page.
"It looks like space junk, I've seen it before usually a big ball of fire with a purple tail," another user Elizabeth Yon commented, which could be another possibility.
Back in July, a large fireball was spotted shooting across the South Florida sky, which was reported to be space debris by the AMS, WPTV West Palm Beach reported.
[img=696x0]https://d.newsweek.com/en/full/1547974/spacex-southern-california-contrail-2018.jpg?w=737&f=a471879560f463f3bb264b2e86a83139[/img]

A SpaceX Falcon 9 rocket launched lights up the Southern California sky on January 22, 2018, with the sun light hitting the contrail left behind as a Spanish Paz satellite was placed into orbit.GETTY IMAGES
"Hey Polk Co. Sheriff, We saw it from our house in Estacada. My wife made a comment that it looked like a missile launch. Our house is at 2000ft in the foot hills," wrote user Tami Bailey.
"Fireballs and bolides are astronomical terms for exceptionally bright meteors that are spectacular enough to be seen over a very wide area," notes the CNEOS.
"Fireballs are very impressive and beautiful. They look like a huge (sometimes gigantic) shooting star," notes the AMS. "If you had enough time to grab your phone to take a picture, it is certainly NOT a fireball. Fireballs usually only last few seconds. Longer fireballs are extremely rare."
If there were clouds above the sighting, "it is certainly NOT a fireball (meteoroids glow usually as soon as they hit Earth's atmosphere and they entirely burn up between 60 miles – 100 km and 40 miles – 70km – the highest clouds can be found at 8 miles above the Earth' surface)," according to the AMS.
Newsweek has contacted the AMS and CNEOS for a comment and further insight on the fireball sighting in Oregon.
[img=696x0]https://d.newsweek.com/en/full/1547967/meteorite-death-valley-california-august-2019.jpg?w=737&f=d76901dbac44a28a23880089ff2dc307[/img]

View of meteorite streaking over Trona Pinnacles near Death Valley, CA during annual Perseid Meteor Showers on August 2, 2019. Police believe the latest fireball reported in Oregon could be linked to this week's meteor shower.GETTY IMAGES
The latest incident is not the only fireball sighting in recent weeks. Earlier this month, one was also reported in Missouri, according to an official report by the AMS.
"The AMS has received over 300 reports so far about of a bright fireball seen above Missouri on Monday, November 11th 2019 around 8:52pm (Nov. 12th 02:54 Universal Time). The event was mainly seen from the Missouri but we also received reports from Indiana, Illinois, Kansas, Minnesota, Nevada, Nebraska, Oklahoma and Wisconsin," the AMS reports.



https://www.newsweek.com/mysterious-larg...ng-1473469
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With a forked tongue the snake singsss...
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from the prior post

Quote:Fireball Streaks Across Night Sky Above St. Louis As Meteor Shower Peaks



good video of the recent Missouri fireball at this link,
american meteor society

Reply
FEBRUARY 12, 2020
Astronomers discover potential near earth objects
[Image: 5-astronomersd.jpg]Artistic impression of two near earth objects. Credit: ESA/P. Carril
Three astronomers from Leiden University (the Netherlands) have shown that some asteroids that are considered harmless for now can collide with the earth in the future. They did their research with the help of an artificial neural network. The results have been accepted for publication in the journal Astronomy & Astrophysics.

Using a supercomputer, the researchers integrated the orbits of the sun and its planets forward in time for 10,000 years. After that, they traced the orbits back in time while launching asteroids from the earth's surface. During the backwards calculation, they included the asteroids in the simulations in order to study their orbital distributions at today's date. In this way, they acquired a database of hypothetical asteroids for which the researchers knew that they would land on the earth's surface
Astronomer and simulation expert Simon Portegies Zwart (Leiden University) explains: "If you rewind the clock, you will see the well-known asteroids land again on earth. This way you can make a library of the orbits of asteroids that landed on earth," The library of asteroids then served as training material for the neural network.
[b]Hazardous Object Identifier (HOI)[/b]
The first set of calculations was performed on the new Leiden super computer ALICE. The neural network runs on a simple laptop. The researchers call their method Hazardous Object Identifier (HOI). That means 'hi' or 'hello' in Dutch.
The neural network can recognize well-known near-earth objects. In addition, HOI also identifies a number of hazardous objects that were not previously classified as such. For example, HOI discovered eleven asteroids that, between the years 2131 and 2923, come closer than ten times the Earth-Moon distance and are larger than a hundred meters in diameter.
That these asteroids have not previously been identified as potentially dangerous is because the orbit of these asteroids is so chaotic. As a result, they are not noticed by the current software from space organizations which is based on probability calculations that use expensive brute force simulations.
[b]Earlier notice of asteroids on a collision course[/b]
According to Portegies Zwart the research is only a first exercise: "We now know that our method works, but we would certainly like to delve deeper in the research with a better neural network and with more input. The tricky part is that small disruptions in the orbit calculations can lead to major changes in the conclusions."
The researchers hope that in the future an artificial neural network can be used to detect potentially hazardous objects. Such a method is much faster than the traditional methods that space organizations use nowadays. By noticing asteroids on a collision course earlier, the researchers say, organizations can sooner think of a strategy to prevent impact.




Explore further
Gaia's first asteroid discoveries



[b]More information:[/b] John D. Hefele et al. Identifying Earth-impacting asteroids using an artificial neural network, Astronomy & Astrophysics (2020). DOI: 10.1051/0004-6361/201935983
[b]Journal information:[/b] Astronomy & Astrophysics [/url]

Provided by [url=https://phys.org/partners/netherlands-research-school-for-astronomy/]Netherlands Research School for Astronomy



https://phys.org/news/2020-02-astronomer...earth.html





NASA has ‘no concerns’ that ‘planet-killer’ asteroid will hit Earth
[Image: josh-photo1.jpg?quality=70&strip=all&w=136&h=136&crop=1]
BY JOSH K. ELLIOTT GLOBAL NEWS
Posted February 13, 2020 1:29 pm
Updated February 13, 2020 2:29 pm

[Image: WochitNASAexplosionPKG_848x480_151848608...&strip=all]


 WATCH: NASA simulates an Armageddon-level asteroid impact.
  • A kilometre-wide asteroid capable of triggering a mass extinction on Earth will cruise past our planet on Saturday, but NASA says fears of an impact are overblown.The incoming asteroid, known as 2002 PZ39, is taller than the Burj Khalifa tower and hurtling through space at almost 55,000 kilometres per hour, according to NASA’s Center for Near-Earth Object Studies (CNEOS).
PZ39 is wide enough and nearly heavy enough to fit NASA’s definition of a “potentially hazardous asteroid,” which has prompted some amateurs to worry it might be a threat to the planet.

“Hey NASA can you confirm or deny this potential collision?” one user tweeted at NASA’s Asteroid Watch account on Wednesday. The question appeared to be a response to several U.K.-based reports of a close call with a “planet-killer” asteroid.


“Those stories are incorrect,” Asteroid Watch replied. “There are no concerns with asteroid 2002 PZ39 passing Earth.”

The asteroid is due to zoom past the planet on Saturday, Feb. 15, according to NASA data. However, the fly-by is only close by space measurements, as it’s projected to come no closer than 5.8 million kilometres to Earth.
That’s 15 times farther away than the moon, Asteroid Watch pointed out.
[b]READ MORE: New pictures of the sun reveal a bubbling ‘caramel popcorn’ surface[/b]
NASA’s Sentry System keeps track of all the known asteroids that could potentially cause catastrophic damage to the Earth. Astronomers generally know when and where these bodies will pass by our planet, and they can predict potential impacts several hundred years into the future.
However, the system is not foolproof, especially when it comes to smaller asteroids that pack the punch of a conventional nuclear bomb.
Last year, astronomers didn’t notice a potential city-killing asteroid until a few days before it whipped past the planet at a distance much closer than the moon. The asteroid didn’t hit Earth, but it sparked public fear because astronomers didn’t see it coming.


Astronomers have known about PZ39 since they first discovered it in 2002. The asteroid’s wobbly orbit takes it past Earth at varying distances every few years, but NASA has a pretty good idea of when and where it will be in relation to our planet at all times.

Tracking records show that Saturday’s fly-by won’t be the closest call Earth has had with PZ39. The asteroid passed slightly closer to our planet back in 1979, unbeknownst to anyone at the time.
PZ39 is also nothing compared to the meteor that wiped out the dinosaurs. That planet-changing asteroid is thought to have been about 16 kilometres across.
NASA says it would take an asteroid impact of “larger than 1-2 kilometres” to alter Earth’s global climate, and something larger than five kilometres to cause mass extinctions.
“NASA knows of no asteroid or comet currently on a collision course with Earth,” the space agency says on its website.
“As best we can tell, no large object is likely to strike the Earth any time in the next several hundred years.”
So take it easy. When the Big One hits, you’ll be dust anyway.



https://globalnews.ca/news/6546453/plane...ing-earth/



Scientists just watched a newfound asteroid zoom by Earth. Then they saw its moon.
By Meghan Bartels a day ago
One of Earth's premier instruments for studying nearby asteroids is back to work after being rattled by earthquakes, and its first new observations show that a newly discovered space rock is actually two separate asteroids.
The instrument is the planetary radar system at the Arecibo Observatory in Puerto Rico. The observatory was closed for most of January, after a series of earthquakes hit the island beginning on Dec. 28, 2019. The observatory reopened on Jan. 29. Meanwhile, on Jan. 27, scientists using a telescope on Mauna Loa in Hawaii spotted an asteroid that astronomers hadn't seen before. The team dubbed the newfound space rock 2020 BX12 based on a formula recognizing its discovery date. 
Because of the size of 2020 BX12 and the way its orbit approaches that of Earth, it is designated a potentially hazardous asteroid. However, the space rock has already come as close to Earth as it will during this pass (2.7 million miles or 4.3 million kilometers); astronomers have calculated the asteroid's close approaches with Earth for the next century, and all will be at a greater distance than this one was.

[Image: mKrB5fRhhqBufYbAaztBLd-650-80.png][img=602x0]https://vanilla.futurecdn.net/space/media/img/missing-image.svg[/img]
Radar images show the binary asteroid 2020 BX12, which scientists discovered this year. (Image credit: Arecibo Observatory/NASA/NSF)
The asteroid's flyby wasn't a threat to life on Earth, but it was an opportunity for scientists who were hoping to learn more about space rocks. On Feb. 4 and 5, the radar station at Arecibo set its sights on 2020 BX12. Based on the observations, the scientists discovered that 2020 BX12 is a binary asteroid, with a smaller rock orbiting the larger rock. About 15% of larger asteroids turn out, on closer inspection, to be binary, according to NASA.
The larger rock is likely at least 540 feet (165 meters) across, and the smaller one is about 230 feet (70 m) wide, according to the observations gathered by Arecibo. When the instrument observed the two space rocks on Feb. 5, they appeared to be separated by about 1,200 feet (360 m).
Scientists couldn't gather enough data to be sure, but they suspect that the two rocks might complete an orbit of each other in 45 to 50 hours and that the smaller rock may be brighter than, and tidally locked with, its companion, meaning the same side always faces the larger object.
Existential dread is a key motivator for asteroid discoveries, and planetary defense experts hope that, by surveying nearby space rocks, they will identify a threat with enough time for us to protect ourselves. But asteroids are also scientifically interesting, since they represent rubble from the formation of the solar system.
https://www.space.com/near-earth-binary-...-moon.html
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Researchers find evidence of a cosmic impact that caused destruction of one of the world's earliest human settlements
[Image: 18-researchersf.jpg]Location of Abu Hureyra (adapted from Moore et al.. (a) Map of the Middle East, showing Abu Hureyra location (AH) in Syria. (b) Map of the Abu Hureyra tell, showing locations of excavation trenches labeled A-G near a back channel of Euphrates River that is now abandoned. Sediment samples from Trenches D, E, and G (blue rectangles) contain abundance peaks in YDB proxies, including spherules, nanodiamonds, meltglass, and platinum. Credit: Scientific Reports (2020). DOI: 10.1038/s41598-020-60867-w
Before the Taqba Dam impounded the Euphrates River in northern Syria in the 1970s, an archaeological site named Abu Hureyra bore witness to the moment ancient nomadic people first settled down and started cultivating crops. A large mound marks the settlement, which now lies under Lake Assad.

But before the lake formed, archaeologists were able to carefully extract and describe much material, including parts of houses, food and tools—an abundance of evidence that allowed them to identify the transition to agriculture nearly 12,800 years ago. It was one of the most significant events in our Earth's cultural and environmental history.
Abu Hureyra, it turns out, has another story to tell. Found among the cereals and grains and splashed on early building material and animal bones was meltglass, some features of which suggest it was formed at extremely high temperatures—far higher than what humans could achieve at the time—or that could be attributed to fire, lighting or volcanism.
"To help with perspective, such high temperatures would completely melt an automobile in less than a minute," said James Kennett, a UC Santa Barbara emeritus professor of geology. Such intensity, he added, could only have resulted from an extremely violent, high-energy, high-velocity phenomenon, something on the order of a cosmic impact.
Based on materials collected before the site was flooded, Kennett and his colleagues contend Abu Hureyra is the first site to document the direct effects of a fragmented comet on a human settlement. These fragments are all part of the same comet that likely slammed into Earth and exploded in the atmosphere at the end of the Pleistocene epoch, according to Kennett. This impact contributed to the extinction of most large animals, including mammoths, and American horses and camels; the disappearance of the North American Clovis culture; and to the abrupt onset of the end-glacial Younger Dryas cooling episode.
The team's findings are highlighted in a paper published in the Nature journal Scientific Reports.
"Our new discoveries represent much more powerful evidence for very high temperatures that could only be associated with a cosmic impact," said Kennett, who with his colleagues first reported evidence of such an event in the region in 2012.
Abu Hureyra lies at the easternmost sector of what is known as the Younger Dryas Boundary (YDB) strewnfield, which encompasses about 30 other sites in the Americas, Europe and parts of the Middle East. These sites hold evidence of massive burning, including a widespread carbon-rich "black mat" layer that contains millions of nanodiamonds, high concentrations of platinum and tiny metallic spherules formed at very high temperatures. The YDB impact hypothesis has gained more traction in recent years because of many new discoveries, including a very young impact crater beneath the Hiawatha Glacier of the Greenland ice sheet, and high-temperature meltglass and other similar evidence at an archaeological site in Pilauco, located in southern Chile.

"The Abu Hureyra village would have been abruptly destroyed," Kennett said. Unlike the evidence from Pilauco, which was limited to human butchering of large animals up to but not younger than the YDB impact burn layer, Abu Hureyra shows direct evidence of the disaster on this early human settlement. An impact or an airburst must have occurred sufficiently close to send massive heat and molten glass over the entire early village, Kennett noted.
The glass was analyzed for geochemical composition, shape, structure, formation temperature, magnetic characteristics and water content. Results from the analysis showed that it formed at very high temperatures and included minerals rich in chromium, iron, nickel, sulfides, titanium and even platinum- and iridium-rich melted iron—all of which formed in temperatures higher than 2200 degrees Celsius.
"The critical materials are extremely rare under normal temperatures, but are commonly found during impact events," Kennett said. According to the study, the meltglass was formed "from the nearly instantaneous melting and vaporization of regional biomass, soils and floodplain deposits, followed by instantaneous cooling." Additionally, because the materials found are consistent with those found in the YDB layers at the other sites across the world, it's likely that they resulted from a fragmented comet, as opposed to impacts caused by individual comets or asteroids.
"A single major asteroid impact would not have caused such widely scattered materials like those discovered at Abu Hureyra," Kennett said. "The largest cometary debris clusters are proposed to be capable of causing thousands of airbursts within a span of minutes across one entire hemisphere of Earth. The YDB hypothesis proposed this mechanism to account for the widely dispersed coeval materials across more than 14,000 kilometers of the Northern and Southern Hemispheres. Our Abu Hureyra discoveries strongly support a major impact event from such a fragmented comet."




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Geologic evidence supports theory that major cosmic impact event occurred approximately 12,800 years ago



[b]More information:[/b] Andrew M. T. Moore et al. Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C, Scientific Reports (2020). DOI: 10.1038/s41598-020-60867-w
[b]Journal information:[/b] Scientific Reports [/url]

Provided by [url=https://phys.org/partners/university-of-california---santa-barbara/]University of California - Santa Barbara
 

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