The main clearinghouse for astronomical discoveries has a new address.

Planetary scientists scratching their heads over the dramatic face-lift that this distant little world underwent sometime between 1994 and 2002.

If one final permit can be obtained — and some Hawaiian preservationists won over — construction on the Advanced Technology Solar Telescope should begin later this year.

Astronomers are still trying to piece together the story of an object that's looking more and more like the aftermath of the collision between two small asteroids.

The Obama administration abandons NASA's Constellation Moon program, but sets its sights farther afield.

Astronomers worldwide were waiting — but two remarkable amateurs in Florida turned out to be the ones watching at just the right time.

NASA managers have decided to halt attempts to free a Martian rover that's been stuck in sand for 10 months and to concentrate instead on "stationary science" that doesn't require mobility.

One of the leading lights of cosmology died on January 21st. Andrew Lange's observations of the cosmic microwave background using the balloon-borne Boomerang experiment revealed that the universe has a flat geometry.

A new analysis reveals that asteroids with "fresh" surfaces may have been disrupted by near-Earth encounters in the last few hundred thousand years.

A meaty review of the impact hazard facing Earth has just been released by the U.S. National Research Council. The bottom line? If Congress and NASA are serious about finding all the truly threatening asteroids in our planet's vicinity, they'd better fund the search properly.

It looks a comet, or at least parts of one, in high-power telescopic images. But in the two weeks since the discovery of P/2010 A2, astronomers are still wondering what's going on with this unusual object and its asteroid sidekick some 95 million miles from Earth.

An international community of space enthusiasts has become adept at reinterpreting images from planetary spacecraft.

Wouldn't it be great to have a comet appear that's bright enough to be seen in broad daylight? That's exactly what happened 100 years ago this week.

An unprecedented yearlong celestial celebration — the International Year of Astronomy 2009 — officially came to a close on January 9th and 10th in Padua, Italy.