This artist's impression shows the Cygnus X-1 binary star system, one of the brightest X-ray sources in the sky. Data suggest that there is a small, very dense object about nine times the mass of the sun in this star system. The object could be a black hole, but, strangely, it appears to have formed without a supernova.
Two new studies have turned up some surprising results and could help explain the evolution of galaxies.
NASA's twin sun-watching STEREO spacecrafts have tracked a comet as it looped around the sun before impact.
New findings suggest that the ability of life to thrive on an alien world might depend on the wild orbits of its planetary neighbors.
The images of these star-nurseries were taken by NASA's Wide-field Infrared Survey Explorer, or WISE, space telescope, which is about three-fourths of the way through it's infrared scan of the entire sky.
The Hubble Telescope was launched on April 24, 1990. NASA says the best is yet to come.
The black hole at the center of the Milky Way, called Sag A*, is much less active than those at the center of other galaxies. A new study points to a simple answer: heat.
CoRoT-7b is so close to its parent star – and so hot – that scientists think it could be the remnant of an evaporated ‘hot Jupiter.’
Scientists have found that dark energy, the force thought to be accelerating the expansion of the universe, may be doing the same thing to local groups of galaxies. That bolsters Einstein's idea of a 'cosmological constant.'
The halo of dark matter that is thought to surround the Milky Way appears to be shaped like a squashed beach ball, astronomers have found.