Cameras on the Mars Reconnaissance Orbiter recently picked up, virtually in real time, an avalanche occurring near the north pole of Mars. Scientists say large blocks of water ice mixed with dust is likely what roared down a slope, though they don't yet know why. Currently, it's early spring in the northern hemisphere of Mars, which seems a likely time for such events. Scientists will be studying the polar region closely to determine whether dynamism on Mars is widespread or occasional.
It's been known for a while now that there is water ice in that polar cap, but the larger debate about water on Mars--how much is there now, how much was there early on, where might water be found today, etc.-- continues. Some argue Mars once had a substantial ocean, and that water played a significant role in shaping the planet we see today. Others argue Mars has never had that much water. One avalanche won't settle that debate either way, but if this avalanche is the first solid evidence that things continue to happen on Mars, the case for water-- and life-- probably strengthens.
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