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Keyword: impact

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  • A prehistoric cosmic airburst preceded the advent of agriculture in the Levant

    10/06/2023 4:16:13 AM PDT · by FarCenter · 27 replies
    Agriculture in Syria started with a bang 12,800 years ago as a fragmented comet slammed into the Earth's atmosphere. The explosion and subsequent environmental changes forced hunter-gatherers in the prehistoric settlement of Abu Hureyra to adopt agricultural practices to boost their chances for survival. That's the assertion made by an international group of scientists in one of four related research papers, all appearing in the journal Science Open: Airbursts and Cratering Impacts. The papers are the latest results in the investigation of the Younger Dryas Impact Hypothesis, the idea that an anomalous cooling of the Earth almost 13 millennia ago...
  • World's 1st mountaintop impact crater discovered in northeastern China

    09/17/2023 6:23:23 AM PDT · by SunkenCiv · 27 replies
    Live Science ^ | September 14, 2023 | Stephanie Pappas
    A two-peaked mountain in northeastern China is the site of the world's first confirmed mountaintop crater.A nearly mile-wide (1.6 kilometer) divot in a Chinese mountaintop is actually an impact crater from a long-ago meteorite landing.The newly discovered crater, located in northeastern China not far from the North Korean border, is the first confirmed mountaintop crater on Earth. Researchers aren't sure when the impact happened, but it left a circular depression and split the mountaintop into two peaks, known as Front Baijifeng and Rear Baijifeng.The mountain peaks are littered with rock fragments known locally as "celestial stone," which turns out to...
  • Human ancestors nearly went extinct 900,000 years ago

    09/01/2023 5:47:16 AM PDT · by logi_cal869 · 51 replies
    Nature ^ | 8/31/2023 | Anna Ikarashi
    Human ancestors in Africa were pushed to the brink of extinction around 900,000 years ago, a study shows. The work1, published in Science, suggests a drastic reduction in the population of our ancestors well before our species, Homo sapiens, emerged. The population of breeding individuals was reduced to just 1,280 and didn’t expand again for another 117,000 years. “About 98.7% of human ancestors were lost,” says Haipeng Li, a population geneticist at the University of Chinese Academy of Sciences in Beijing, who co-led the study. He says that the fossil record in Africa and Eurasia between 950,000 and 650,000 years...
  • Extreme Cooling Caused Extinction of Early Humans in Europe

    08/17/2023 10:37:06 AM PDT · by SunkenCiv · 23 replies
    Heritage Daily ^ | August 10, 2023 | Markus Milligan
    Study Led by the University College London (Ucl) Suggests That an Extreme Cooling Period Approximately 1.1 Million Years Ago Likely Contributed to the Extinction of Early Human Populations in Europe.Based on palaeoclimate evidence, the researchers found the occurrence of previously unknown extreme glacial conditions that pushed the European climate to levels beyond what archaic humans could tolerate, emptying the continent of human populations.The earliest human remains discovered in Europe originate from Iberia and provide evidence that early humans had migrated from southwest Asia around 1.4 million years ago...Researchers from UCL, the University of Cambridge, and CSIC Barcelona studied the chemical...
  • Scientists Find Heat-Emitting Blob On The Far Side Of The Moon

    07/11/2023 10:52:04 AM PDT · by Red Badger · 43 replies
    Daily Caller ^ | July 11, 2023 10:41 AM ET | KAY SMYTHE
    Scientists announced in early July that an enormous, heat-emitting blob is currently sitting on the far side of the moon. Though this is not the first time humans have stumbled upon the bizarre blob of heat-emitting granite, according to National Geographic, the news has once again surprised the scientific community. “We have discovered extra heat coming out of the ground at a location on the Moon believed to be a long dead volcano which last erupted over 3.5 billion years ago,” lead researcher Matt Siegler wrote in a press release regarding the discovery. “It’s around 50km across, and the only...
  • Citing shipyard squeeze, Navy wants commercial option for dismantling nuclear-powered carrier

    07/11/2023 4:22:00 AM PDT · by Fish Speaker · 52 replies
    Breaking Defense ^ | July 10, 2023 at 3:18 PM | Justin Katz
    WASHINGTON — The Navy has published the final draft of its environmental impact statement assessing how it should go about dismantling the former aircraft carrier Enterprise (CVN-65), a process that will likely set decades-long precedents for future nuclear-powered ships. Environmental impact statements, as the name implies, are lengthy documents that outline the dangers to the ecosystem that disposing of decades-old nuclear reactors can pose, as well as identify one of several courses of action with which the Navy prefers to move forward. Due to the numerous state and federal agencies that must weigh in, as well as considering the general...
  • Watch Live: First Lady Jill Biden Hosts Meeting on Impact of Overturning of Roe v. Wade

    06/20/2023 1:05:00 PM PDT · by ChicagoConservative27 · 29 replies
    Breitbart ^ | 06/20/2023 | BREITBART NEWS
    First Lady Jill Biden will host a meeting discussing the impact of the Supreme Court Dobbs decision and the overturning of Roe v. Wade on Tuesday. Jill Biden will be joined by Assistant to the President and Director of the White House Gender Policy Council Jennifer Klein at the White House in a discussion on the impact of Dobbs v. Jackson on abortion as the country approaches the one-year anniversary of the overturning of Roe v. Wade.
  • Forensic evidence suggests Paleo-Americans hunted mastodons, mammoths and other megafauna in eastern North America 13,000 years ago

    06/14/2023 10:41:18 AM PDT · by SunkenCiv · 31 replies
    The Conversation ^ | June 14, 2023 | Christopher R. Moore
    Based on sites excavated in the western United States, archaeologists know Paleo-American Clovis hunter-gatherers who lived around the time of the extinctions at least occasionally [emphasis added] killed or scavenged Ice Age megafauna such as mammoths. There they've found preserved bones of megafauna together with the stone tools used for killing and butchering these animals...Unfortunately, many areas in the Southeastern United States lack sites with preserved bone and associated stone tools that might indicate whether megafauna were hunted there by Clovis or other Paleo-American cultures. Without evidence of preserved bones of megafauna, archaeologists have to find other ways to examine...
  • Massive ‘anomaly’ lurks beneath ice in Antarctica

    12/29/2016 2:12:09 PM PST · by heterosupremacist · 64 replies ^ | 12/29/2016 | Jasper hamill
    Scientists believe a massive object that could change our understanding of history is hidden beneath the Antarctic ice. The huge and mysterious “anomaly” is thought to be lurking beneath the frozen wastes of an area called Wilkes Land. The area is 151 miles across and has a minimum depth of about 2,700 feet. Some researchers believe it is the remains of a truly massive asteroid more than twice the size of the Chicxulub space rock that wiped out the dinosaurs. If this explanation is true, it could mean this killer asteroid caused the Permian-Triassic extinction event, which killed 96 percent...
  • Mammoths may have died after impact from space

    06/02/2013 10:13:01 PM PDT · by rjbemsha · 22 replies
    World Science ^ | 20 May 2013 | University of Cincinnati
    New re­search sug­gests wooly mam­moths, the gi­gantic cousins of mod­ern ele­phants, al­so died out as a re­sult of cli­mate change fol­low­ing a cos­mic im­pact—and that blast may have shocked hu­man popula­t­ions as well. Ei­ther a com­et scrap­ing the at­mos­phere or a me­te­or­ite slam­ming in­to the Earth caused glob­al-scale com­bus­tion, scorch­ing the air, melt­ing bed­rock and al­tered the course of Earth’s his­to­ry, ac­cord­ing to re­searcher Ken­neth Tanker­s­ley of the Uni­vers­ity of Cin­cin­nati. Tanker­s­ley said while the cos­mic strike had an im­me­di­ate and deadly ef­fect, the long-term side ef­fects were far more dev­as­tat­ing – si­m­i­lar to Kra­ka­to­a’s af­termath but many times worse...
  • Diamonds Rained Down During Ice Age

    07/07/2008 2:05:25 PM PDT · by decimon · 42 replies · 439+ views
    Live Science ^ | JUL 7, 2008 | Ker Than
    Diamonds and precious metals found in the eastern United States might have rained down during the last Ice Age after a comet shattered over Canada and set North America ablaze, all leading to a mass die-off of animals and humans. New chemical analyses of diamond, gold and silver found in Ohio and Indiana reveal the minerals were transported there from Canada several thousand years ago. The question is, how?
  • Explosions In Space May Have Initiated Ancient Extinction On Earth

    04/12/2005 1:12:15 PM PDT · by doc30 · 39 replies · 1,259+ views
    Science Daily ^ | 4/12/05 | NASA/Goddard Space Flight Center
    Explosions In Space May Have Initiated Ancient Extinction On Earth Scientists at NASA and the University of Kansas say that a mass extinction on Earth hundreds of millions of years ago could have been triggered by a star explosion called a gamma-ray burst. The scientists do not have direct evidence that such a burst activated the ancient extinction. The strength of their work is their atmospheric modeling -- essentially a "what if" scenario. The scientists calculated that gamma-ray radiation from a relatively nearby star explosion, hitting the Earth for only ten seconds, could deplete up to half of the atmosphere's...
  • The Planet Has Seen Sudden Warming Before. It Wiped Out Almost Everything

    12/09/2018 8:08:53 AM PST · by EdnaMode · 113 replies
    New York Times ^ | December 7, 2018 | Carl Zimmer
    Some 252 million years ago, Earth almost died. In the oceans, 96 percent of all species became extinct. It’s harder to determine how many terrestrial species vanished, but the loss was comparable. This mass extinction, at the end of the Permian Period, was the worst in the planet’s history, and it happened over a few thousand years at most — the blink of a geological eye. On Thursday, a team of scientists offered a detailed accounting of how marine life was wiped out during the Permian-Triassic mass extinction. Global warming robbed the oceans of oxygen, they say, putting many species...
  • Trilobites: Sudden Appearance and Rapid Burial

    02/01/2014 10:34:31 AM PST · by lasereye · 23 replies
    ICR ^ | Feb 1, 2014 | Tim Clarey, Ph.D
    Trilobites are one of the most popular fossils for collectors and are found all over the world. The Ute Indians used one species as an amulet, and there is even a cave in France called the Grotte du Trilobite that contained a relic made out of one of these extinct marine creatures.1,2 Trilobites are members of the phylum Arthropoda, which includes spiders, insects, and crustaceans. Today, members of this group make up at least 85 percent of the species on Earth and live in every environment. Insects alone account for over 870,000 of these species.1 God designed all arthropods with...
  • Fossils Record Reveals Ancient Migrations, Trilobite Mass Matings

    03/18/2011 5:47:00 PM PDT · by SunkenCiv · 42 replies
    Science News ^ | St Patrick's Day, March 17, 2011 | Reuters
    In a quest that has taken him from Oklahoma to Morocco and Poland, Brett has analyzed multiple examples of mass trilobite burial. A smothering death by tons of hurricane-generated storm sediment was so rapid that the trilobites are preserved in life position. These geologic "snapshots" record behavior in much the way that ancient Roman life was recorded at Pompeii by volcanic ash. Burial was rapid, Brett said, but also somewhat delicate. Trilobites, like other arthropods, shed their hard exoskeletons from time to time. "We find molted pieces lying immediately adjacent to each other," he said. "This is proof that the...
  • Global warming, not asteroid, cause of extinction?

    01/21/2005 7:09:59 AM PST · by Zon · 45 replies · 1,455+ views
    c|net ^ | 1/20/2005 | Michael Kanellos
    Two hundred and fifty million years ago, the majority of life on earth may have suffocated. The "Great Dying," a catastrophic event that killed 90 percent of Earth's marine life and 75 percent of the life on land, was caused by a combination of warmer temperatures and lower oxygen levels, according to a recent study by researchers at the University of Washington. In other words, the extinction was precipitated by global warming, rather than an asteroid collision, the reigning theory. The findings, to be published in the magazine Science, are largely based on comparisons of fossils found in South Africa's...
  • Undersea slide set off giant flow

    11/22/2007 3:56:49 PM PST · by george76 · 48 replies · 413+ views
    BBC News ^ | 22 November 2007 | Paul Rincon
    An enormous underwater landslide 60,000 years ago produced the longest flow of sand and mud yet found on Earth. The landslide off the coast of north-west Africa dumped 225 billion metric tonnes of sediment into the ocean in a matter of hours or days. The flow travelled 1,500km (932 miles) - the distance from London to Rome - before depositing its sediment. The work, by a British team of researchers has been published in the academic journal Nature. The massive surge put down the same amount of sediment that comes out of all the world's rivers combined over a period...
  • Researchers Find Rare 17-Pound Meteorite in Antarctic Ice

    02/01/2023 7:03:10 PM PST · by Fractal Trader · 18 replies
    Smithsonian ^ | 24 January 2023 | Carlyn Kranking
    A team of researchers has discovered five new meteorites in Antarctica—one of which weighs a whopping 16.7 pounds. For about a week and a half, the scientists rode snowmobiles and slept in tents, enduring the cold Antarctic summer temperatures of 14 degrees Fahrenheit as they searched for space rocks in the ice. Their largest find is among the heaviest meteorites ever found on the continent and could provide a glimpse into our solar system’s history. “The object comes from the asteroid belt and probably plopped down into the Antarctic blue ice several tens of thousands of years ago,” Ryoga Maeda,...
  • Giant asteroid rocked Antarctica

    10/17/2004 9:26:51 PM PDT · by SunkenCiv · 20 replies · 1,011+ views
    The collision happened around 870 000 years ago, a time when Homo erectus, man’s early ancestor, was still roaming the planet. Molten asteroid slabs melted through more than 1.5 kilometres of ice and snow to reach the underlying bedrock... Billions of tons of ice, snow and rock would have been vaporised and thrown into the atmosphere. Rock particles that fell to the ground have been located more that 5 000 kilometres away in Australia. The impact was so immense that it is being considered as the cause of a reversal of the Earth’s magnetic polarity around this time. One...
  • Antarctic Forests Reveal Ancient Trees

    11/08/2004 7:59:44 AM PST · by Dallas59 · 27 replies · 1,121+ views
    Discovery Channel ^ | 11/5/04 | Larry O'Hanlon
    Nov. 5, 2004 — A quarter-billion years ago, forested islands flashed with autumnal hues near the South Pole — a polar scene unlike any today, researchers say. Geologists have discovered in Antarctica the remains of three ancient deciduous forests complete with fossils of fallen leafs scattered around the tree trunks. The clusters of petrified tree stumps were found upright in the original living positions they held during the Permian period.