"An asteroid this size impacts Earth on average every few thousand years and could cause severe damage to a local region," the European Space Agency said.

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...

you basically wipe out the whole city and some of the environs,” said Betts. The best modern comparison is the 1908 Tunguska Event when an asteroid or comet fragment measuring 30-50 metres ...