New observations from a NASA orbiter reveal that water and rock freely mingled across (or under) much of the Red Planet's surface.

It took three years to settle on a name for the third-largest object in the Kuiper Belt.

Astronomers have designed a neural network that can determine the particulars of binary star systems by just examining their light curves — and it can do it really, really fast.

The Astronomical League has announced its best webmaster for 2008.

A recent survey of stars in the Orion Nebula Cluster reveals that less than 10% of stars there have enough material in their surrounding disks to form Jupiter-sized planets.

Where did the dozens of known binary asteroids come from? According to a new finding, sunlight alone can force a body to spin in such a frenzy that it literally flies apart.

A subclass of supernovae that fades much faster than expected reveals possible kinks in astronomers' theories of what causes these explosions.

Traces of water recently found in glassy granules brought back 40 years ago by the Apollo 15 crew suggest scientists haven't quite figured out yet just how our Moon formed.

The main mirror for the world's most advanced flying observatory has been transformed from a carefully shaped and polished piece of glass into a highly reflective optical component ready to study the infrared universe.

Recent calculations for a pair of failed stars add to astronomers' scant knowledge of brown dwarfs and will help set a reference point for future studies.

During its first flyby of Mercury, NASA"s Messenger spacecraft found much less iron on the planet’s surface than expected and a cloud of ionized atoms — including water — caught up in the planet’s magnetosphere. And that’s just for starters.

The Solar and Heliospheric Observatory has now found more comets than all other comet discoverers put together — not bad for a spacecraft that was designed to study the Sun.

Astronomers confirm a low-mass star orbits the Lion’s heart, the bright blue star imaged here to the lower right. But what exactly is it?

On June 30, 1908, a cosmic impact leveled more than 800 square miles of Siberian taiga — and forever changed how we view the threat to Earth posed by even modest interplanetary collisions.