Scientists discover a new type of "invisible" supermassive black hole.
The clusters in Abell 576 are estimated to be crashing into one another at over 7 million miles per hour.
A 'Goldilocks' planet hailed as the first world outside our solar system capable of supporting life might actually be too hot.
Streams of hot gas swirling around Saturn have been traced to two icy moons previously thought to be geologically dead worlds.
The dwarf planet that forced astronomers to strip Pluto of its planethood is not only bigger than the former ninth planet, but also much more massive, a new study finds.
NASA engineers are discussing a possible spacewalk repair for a damaged area of the space shuttle Atlantis' heat shield.
After a two-day orbital chase, NASA's shuttle Atlantis has arrived at the International Space Station.
An inspection of the space shuttle Atlantis' heat shield found no signs of significant damage after its Friday launch.