The faraway exoplanet could help provide answers as to why there are hardly any planets with twice the diameter of Earth.

A 'potentially hazardous' asteroid the size of a pyramid will skim past Earth tomorrow, NASA has revealed. The asteroid, ...

The space rock, which measures 150 feet across and is traveling at 38,922 miles per hour, is one of five on NASA's radar.

Even more exciting, the model suggests that some Earth-like planets could form in the habitable zone—the region around a star ...

The substance can contain up to 1.5 percent water, and if the ringwoodite under the surface has just one percent water in its ...