New findings challenge a theory that a meteor explosion or impact thousands of years ago caused catastrophic fires over much of North America and Europe and triggered an abrupt global cooling period, ...

At the end of the Pleistocene period, approximately 12,800 years ago — give or take a few centuries — a cosmic impact triggered an abrupt cooling episode that earth scientists refer to as the Younger ...

Microscopic grains of alien dust buried in the sediment at the bottom of the ocean could be evidence of a comet that exploded in Earth's atmosphere 12,800 years ago. One of the leading refutations is ...

A long-debated platinum spike in Greenland ice is best explained by volcanic activity rather than a cosmic impact, reshaping ideas about what triggered the Younger Dryas cooling. An unusual platinum ...

(Santa Barbara, Calif.) — Touchdown airbursts — a type of cosmic impact that may be more common than the crater-forming, dinosaur-killing kind — remain somewhat less understood. UC Santa Barbara Earth ...

Microscopic grains of alien dust buried in the sediment at the bottom of the ocean could be evidence of a comet that exploded in Earth's atmosphere 12,800 years ago. This hypothetical event, known as ...