Comments on: A river ran through it https://habitablezone.com/2012/09/27/a-river-ran-through-it/ Tue, 07 Apr 2026 19:18:10 -0700 hourly 1 http://wordpress.org/?v=3.3.1 By: alcaray https://habitablezone.com/2012/09/27/a-river-ran-through-it/#comment-18927 alcaray Sat, 29 Sep 2012 17:21:33 +0000 http://habitablezone.com/?p=22898#comment-18927 http://www.youtube.com/watch?feature=player_embedded&v=HYHc2alzdUk -edit- No info about the dating, though. http://www.youtube.com/watch?feature=player_embedded&v=HYHc2alzdUk

-edit- No info about the dating, though.

]]> By: alcaray https://habitablezone.com/2012/09/27/a-river-ran-through-it/#comment-18855 alcaray Thu, 27 Sep 2012 21:01:23 +0000 http://habitablezone.com/?p=22898#comment-18855 cf all the craters that litter the landscape. cf all the craters that litter the landscape.

]]> By: ER https://habitablezone.com/2012/09/27/a-river-ran-through-it/#comment-18848 ER Thu, 27 Sep 2012 19:38:50 +0000 http://habitablezone.com/?p=22898#comment-18848 But that kind of depositional feature doesn't last long on earth, it is usually eroded away or covered up. If that is evidence of an ancient Martian stream, how ancient? Could an old stream bed simply lie on the surface for any length of time at all without being modified beyond recognition? I realize erosional processes are slow and subtle on Mars, but they surely aren't non-existent. That looks like it was underwater just a few days ago. But that kind of depositional feature doesn’t last long on earth, it is usually eroded away or covered up.
If that is evidence of an ancient Martian stream, how ancient? Could an old stream bed simply lie on the
surface for any length of time at all without being modified beyond recognition? I realize erosional
processes are slow and subtle on Mars, but they surely aren’t non-existent. That looks like it was
underwater just a few days ago.

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