Galaxies

NASA's MESSENGER probe has imaged every square meter of the planet's surface

Although unlikely, there is a small chance the Comet Siding Spring, an estimated eight to 50 kilometers in diameter, could collide with Mars in October 2014

A plan is afoot for China and Europe to collaborate on a space station that could be operational by 2020

The Dragon capsule is due to deliver 544 kilograms of scientific experiments and supplies to the space station on Saturday

All stars are born in groups but then slowly disperse into space. A new theory seeks to explain how these groups form and fall apart or, in rare cases, persist for hundreds of millions of years

A Jupiter-like gas giant, 335 light-years from Earth, is caught in the process of formation by the European Southern Observatory's Very Large Telescope in Chile

The discovery could help astronomers better understand how these behemoths grow

Cassini's observations are giving scientists a look at processes that occur during star explosions

NASA’s Solar Dynamic Observatory captures video of superheated plasma loops far larger than Earth as they rain down on solar surface

Rocketing through space at more than three million kilometers per hour, six speedy stars were likely ejected from the giant black hole in the center of the Milky Way

Water on the moon was there as the moon formed, not delivered later by solar wind and comets

Astronomers estimate 4.5 billion Earth-like planets are spread throughout the Galaxy