| You are subscribed to Breaking News for NASA. This information has recently been updated, and is now available. 07/10/2014 12:00 PM EDT Repeated high-resolution observations made by NASA's Mars Reconnaissance Orbiter (MRO) indicate the gullies on Mars' surface are primarily formed by the seasonal freezing of carbon dioxide, not liquid water.
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Friday, July 11, 2014
NASA Spacecraft Observes Further Evidence of Dry Ice Gullies on Mars
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