Dinosaur-killing space rock may have originated at the edge of the solar system

The chunk of space rock that killed the nonavian dinosaurs may have been a piece of a comet that Jupiter’s gravity kicked onto a collision course with Earth. 

A new study suggests that the dinosaur-killing object was not an asteroid from between Jupiter and Mars, as is often hypothesized. Instead, the study authors argue, the impactor was a piece of a comet from the Oort cloud, a mass of icy bodies that surrounds the outer edges of the solar system. 

Source link