YR4 might collide with the Moon in 2031, with a 4.3% chance of impact, according to NASA's updated calculations.

On June 19, 2004, at the Kitt Peak National Observatory in Tucson, Arizona, astronomers Roy Tucker, David Tholen, and Fabrizio Bernardi discovered Asteroid Apophis. This Near-Earth Object (NEO ...

A hard-driving space probe is still cruising beyond Pluto, its instruments healthy and its fuel tanks half full. Yet a single ...