This image of Mars shows the north polar ice cap, the border between highlands and lowlands, former river valleys, plains covered by dark sands and the large Hellas Planitia impact basin in the south. Credit: ESA/DLR/FU BerlinMissBunny09 t1_j97rhc5 wrote
Do the remains of river valleys mean there was once water on Mars?
mortalphysicist t1_j98ntux wrote
Yes! And if you notice the upper half of the picture looks like a dry ocean (you can see the high edge of a coast line). Now, one thing you notice is there are very few craters in that area that looks like it once had an ocean.
This is more evidence that this particular area was covered with water, which absorbed many of the impacts!
MissBunny09 t1_j98occn wrote
Amazing, absolutely amazing. Thank you so much for sharing!
jdippey t1_j98lxix wrote
There was indeed liquid water on Mars in the distant past.
MissBunny09 t1_j98og7x wrote
That could mean so many things. Thank you!
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