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Originally Posted by aurora
I did recently read an article on the apparent wet streaks on Mars (the ones that appear to come out of a crater wall and run down into the bottom, and are darker than the surrounding terrain). [...]
There is still some debate about whether it is water or whether it is a dust flow.
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http://mars.jpl.nasa.gov/gallery/mar...6subs_100.html |
Trouble is, those dark streaks are seen not only on crater walls, but also on
butte slopes. I could almost see the ones in crater walls being supplied from aquifers in the surrounding plain, but you'd think the buttes would have weeped themselves dry long ago.
Knowing what we know about the patina of light-covered dust over darker stuff seen in so many places on Mars, it's a lot easier to imagine all those dark streaks are landslides.
I guess time will tell.