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cosmic impactsScienceDaily
•79% Informative
Researchers continue to expand the case for the Younger Dryas Impact hypothesis.
The idea proposes that a fragmented comet smashed into the Earth 's atmosphere 12,800 years ago .
Material indicative of force and temperature involved in such an event, including platinum, microspherules, meltglass and shock-fractured quartz.
The sediment layer associated with the airburst stretches across much of the northern hemisphere, but can also be found in locations south of the equator.
Fractured quartz grains and meltglass have been found in more present-day samples of above ground explosions, such as at the Trinity atomic bomb test site in New Mexico .
These lower-pressure shocked quartz grains join a growing suite of impact proxies that together make a case for a fragmented comet that caused widespread burning.
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