Science news articles about 'comet theory'

... of early Paleoindians who may have been living on the continent. Proponents of the comet theory suggest Clovis culture may have been dramatically ... study of charcoal-pollen records soon after the comet theory was proposed in PNAS by an international team ...

... Gill of the University of Wisconsin–Madison says her team has found no evidence to support a controversial comet theory for an ice age extinction event ...

No evidence of an extraterrestrial impact 13,000 years ago, studies say.

New research challenges the controversial theory that an ancient comet impact devastated the Clovis people ... solution for an archaeological problem that does not exist." The comet theory first emerged in 2007 when a team ...