Water flows on Mars, before our very eyes?
| 18:00 06 December 2006, NewScientist.com news service: Liquid water has flowed on the surface of Mars within the past five years, suggest images by the now lost Mars Global Surveyor (MGS). The results appear to boost the chances that Mars could harbour life.In 1999, MGS spotted gullies carved on the sides of Martian slopes. Thousands of gullies have been imaged since then, most recently by the Mars Reconnaissance Orbiter (MRO) (see Stunning snaps from the best camera ever sent to Mars).  Many scientists believe the gullies were carved by liquid water, although others have argued they are due to avalanches of carbon dioxide gas or rivers of dust. The gullies appear to have formed sometime in the past several hundred thousand years, since impact craters have not accumulated on top of them. But exactly how long ago material flowed through them has not been clear. Now, new flows have appeared in two of the gullies monitored by MGS, showing that they have been active within the past several years. Allan Treiman of the Lunar and Planetary Institute in Houston, Texas, US, agrees that something flowed recently to make the observed changes. But he is not convinced that water was involved. "There is no direct evidence of water in the images – only that something flowed downhill. My money is on sand and dust, because there's lots and lots of sand and dust on Mars."Read more... This was seized 4 u at New Scientist tags: mars,water,space,liquid water |
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