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Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 February 21 Melting Snow and the Gullies of Mars Credit: P. Christensen (ASU), THEMIS, Mars Odyssey, NASA Explanation: Tantalizing images of gullies on Mars have offered striking evidence for recent flows of liquid water. But Mars is too cold and its atmosphere too thin for liquid water to exist on the surface. Still a new and compelling explanation for gullies carved by liquid water was inspired by...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 February 5 Unusual Gullies and Channels on Mars Credit: Malin Space Science Systems, MGS, JPL, NASA Explanation: What could have formed these unusual channels? Inside Newton Basin on Mars, numerous narrow channels run from the top down to the floor. The above picture covers a region spanning about 1500 meters across. These and other gullies have been found on Mars in recent high-resolution pictures taken by the...

Tuesday, 7 January, 2003, 14:43 GMTGullies seen to form on Mars What created the gullies on Mars is still a mystery By Dr David Whitehouse:: BBC News Online science editor The formation of gullies has been seen for the first time on Mars. According to University of Melbourne geologist Dr Nick Hoffman, gullies near the Red Planet's south pole form as the seasonal ice cap retreats in the Martian spring. "In itself the observation of active flows is a dramatic discovery since no movement has yet been seen on Mars, except for some dry dust avalanches," he told BBC News...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 October 24 Gullies on Mars Credit: Malin Space Science Systems, MGS, JPL, NASA Explanation: The Gullies of Mars would probably not have been sensational enough for the title of a vintage Edgar Rice Burroughs story about the Red Planet. But it would get the attention of planetary scientists today. First identified in high resolution images of Mars recorded by the orbiting Mars Global Surveyor spacecraft, the gullies...