It's a big week for astronomers, as a major meteor shower sparks up the night and the "comet of the century" nears Earth.

Two years ago, a NASA spacecraft smashed into a small asteroid millions of miles from Earth to test a technique that could ...

While NASA has several reasons for pursuing such an ambitious mission, the biggest is scientific exploration and discovery.

NASA's Europa Clipper will take off on a long journey to Jupiter's moon Europa. The icy moon could potentially host alien ...