Nearly 13,000 years ago, a vast, hurtling fragment of a comet exploded over the US, according to a controversial theory. Now, scientists have found evidence of this cataclysmic event.
New geological evidence unearthed in the US suggests that a catastrophic cosmic event may have wiped out a once-thriving culture more than 12,800 years ago.
Researchers analyzing sediment samples in California, Arizona and New Mexico discovered shock... [4409 chars]