More than a 150 years ago, before Neptune was ever sighted in the night sky, French mathematician Urbain Le Verrier predicted the planet's existence based on small deviations in the motion of Uranus.

The biggest and brightest full moon of the year will occur this weekend. An estimated 16% brighter than normal, this spectacular ‘Supermoon’ will be visible in the night sky on Saturday (May 5) at 11:35 p.m. EDT.

BOULDER, Colo., April 5, 2012 /PRNewswire/ -- The Ball Aerospace & Technologies Corp. Kepler Mission for NASA will continue its mission following a program extension through 2016.

Phobos is the larger and closer of the two natural satellites of Mars. Despite decades of Martian exploration, we still know very little about Phobos.

The prevailing model for planetary accretion, also called fractal assembly, and dating back as far as the 18th century, assumes that the Solar System’s planets grew as small grains colliding chaotically, coalescing into bigger ones, colliding yet more until they formed planetesimals.