If your sky is clear tonight (Feb. 10), be sure to check out the southeast sky about an hour or so after sundown for an eye-catching site: Jupiter and the moon shining together.
For the first time, an exomoon orbiting a free-floating exoplanet may have been discovered in a microlensing survey.
HD 106906b is no "ordinary" alien planet -- it shouldn't exist. Continue reading →
NASA's MESSENGER mission is turning up more questions than answers as it photographs strange recently-formed features on Mercury's surface.
NASA's New Horizons probe has achieved another milestone on its already historic mission to our solar system's erstwhile ninth planet: it is now the closest any spacecraft has ever come to Pluto.