Dinosaur-killing space rock ‘was a comet’

24th January, 2013

New research has suggested the cosmic impact that ended the reign of the dinosaurs may not have been a slow moving large asteroid as widely accepted but might instead have been a speeding comet.

The evidence includes the analysis of ratios between iridium and osmium in deposits related to the Chixulub event as compared to other extraterrestrial examples which suggests the object may have been much smaller than originally thought.

If true, the size of the crater could better be explained by a much faster moving body, the most obvious candidate being a long-period comet.

BBC: Dinosaur-killing space rock ‘was a comet’