Mars crater may actually be ancient supervolcano

Scientists from NASA and the Planetary Science Institute in Tucson, Ariz., have identified what could be a supervolcano on Mars—the first discovery of its kind. The volcano in question, a vast circular basin on the face of the Red Planet, previously had been classified as an impact crater.

Cosmic rays alter chemistry of lunar ice

A bombardment of cosmic rays on the moon's surface could be creating  complex carbon chains similar to those that form the foundations of biological life.

Moon's magnetic rock may have come from asteroid

The moon's somewhat bizarre magnetic field may have been shaped by a massive asteroid impact, which left some of its material behind.

Messenger delivers first Mercury photo

NASA's released the first picture of the surface of Mercury taken by its Messenger spacecraft early yesterday morning.

NASA comet images show man-made crater

The Stardust spacecraft's Valentine's Day flyby of the Tempel 1 comet has delivered pictures of the comet that clearly show the effects of its last encounter with a spacecraft in 2005.