Comet impact may have triggered decline of Ohio's Hopewell people 1,600 years ago
Comet impact may have triggered decline of Ohio's Hopewell people 1,600 years ago
Did comet's fiery destruction lead to downfall of ancient Hopewell? Researchers at the University of Cincinnati find evidence of cosmic cataclysm 1,500 years ago at 11 ancient sites
Did comet's fiery destruction lead to downfall of ancient Hopewell?
