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Fraser
2008-Apr-24, 06:31 AM
Mars is a dead world, unchanging for billions of years. Right? Maybe not. Researchers from Brown University have found evidence for thick, recurring glaciers on the surface of Mars. This means that the climate on Mars might be much more dynamic than previously believed. Perhaps the climate could change again. And liquid water underneath these [...]

More... (http://www.universetoday.com/2008/04/23/mars-was-recently-blanketed-by-glaciers/)

jlhredshift
2008-Apr-24, 11:57 AM
Mars is a dead world, unchanging for billions of years. Right? Maybe not. Researchers from Brown University have found evidence for thick, recurring glaciers on the surface of Mars. This means that the climate on Mars might be much more dynamic than previously believed. Perhaps the climate could change again. And liquid water underneath these [...]

More... (http://www.universetoday.com/2008/04/23/mars-was-recently-blanketed-by-glaciers/)

The amazing thing to me is that Mars shows "frozen" snapshots of landforms, both glacial and otherwise for us to discern and learn from. Whereas here on Earth constant erosion hides these things from us until we look really hard.

trinitree88
2008-Apr-26, 04:28 PM
Fraser. Not really a surprise. The iron-60 seen in deep sea sediments on Earth reflect at least a single passage of a supernova ejecta cloud. The ratio of iron oxides to water in such a cloud is small, so the solar system intrusion seen by Brian Fields et al, reaching inwards to earth orbit infers that Mars was sprinkled too.
As was previously noted elsewhere, the existence of the Local Bubble is generally considered to have been created by a succession of supernovae migrating from the Centaurus-Sco Association in this arm of the galaxy over tens of millions of years, so multiple sprinklings are possible, though certainly a true inundation should show as anomalous isotopic ratios in the hematite formed there. It will be interesting to see the Mars Lab results in detail. ...pete