One is a star orbited by a brown dwarf — an object that straddles ... Rocky planets, or the rocky cores of giant planets, need a ready supply of heavy elements in order to form.

Gaia, a mission designed to map stars, has accidentally become a planet hunter. Using precise astrometry, it detected stellar ...

Over 50,000 submissions are made for images on U.S. stamps every year, and out of those, about 40 are turned into real stamps ...