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  • curprev 18:50, 31 October 2021Suitupandshowup talk contribs 1,067 bytes +369 →‎Summary: added more info
  • curprev 11:11, 31 October 2021Suitupandshowup talk contribs 698 bytes +698 Changes in gullies, as seen by HiRISE This observation is evidence that something other than flowing water can make gullies. Observations like this show that gullies are forming today. Although we cannot pin down the season of this event, locations where HiRISE has been able to image more often demonstrate that this sort of event generally occurs in the winter, when liquid water is very unlikely. Despite their resemblance to water-formed ravines on Earth, carbon dioxide may play a key role...