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Saturday, November 13, 2004 Mars Gullies Formed by Subsurface Water Gullies on Mars, formed by water? Credit: NASA/JPL/MSSS Researchers at NASA Ames Research Center have released findings that show that the much debated gullies on Mars are most likely formed by near-pure liquid water -- continuing today. Although there has been some speculation as to whether or not carbon dioxide or other causes formed these features, it now appears most likely that present-day liquid water is the culprit. While the match still isn't perfect, no other theory comes as close. If true, this find has several important implications. With liquid water nearby, these gullies could become desirable sites for manned missions. More importantly, however, they could be prime sites to look for signs of life on Mars. There are very few places, if any, on Earth where liquid water does not contain life. (More info: Space.com) @ 14:32 EST