The significance of this is that Mars is experiencing climate change, because the present conditions are not conducive to the formation of all this CO2 to begin with in the polar region. So sometime in the distant past, Mars was colder than it is now to form a permanent CO2 deposit. Subsequent to that, it has warmed and we are seeing that earlier deposit being eroded away.
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Mars is an active planet, and over a range of timescales changes occur, even in the surface.Michael Malin
Why is Mars warmer today that it was in the past, we really have no way of knowing why.
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By the end of this year, we're going to have three Mars missions active all at the same time, ... That should give us a very good picture of what's going on today.
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Actually, we have five or six of these types of craters, ... The number of young craters we've seen is much less than the number we'd predicted.
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We see everything from sand dunes covered with frost, water ice clouds hanging over volcanoes and ancient craters being eroded by high winds.
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This set of photos shows the diversity of things we've been seeing on Mars during the last several months,
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Based on Topics: Change Quotes, Past Quotes, Present QuotesBased on Keywords: eroded
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