A different take on sedimentary deposits on Mars. Sounds plausible, but I hope it ain't so...
"Second star to the right - Then straight on until morning!" - Peter Pan
Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars
If the water was originally too hot and now its frozen, there must of been a time when it was just right. Nevertheless, inhabiting Mars now is a terrifically difficult problem. I wonder how long it might be, if ever, before a Human is born on Mars?
This theory could be right. So could the others more friendly to life and liquid water. Mars is after all an entire world and its geology does not have to be homogeneous over its entire vast surface.
I have seen however that over the decades most theories of alien life in the solar system have been left in tatters but perhaps we have now learned that water does exist in some unlikely places even if life has not. I am thinking of the latest information about possible water ice in Shackleton Crater on the Moon.
Time and further exploration will tell,
A nebula in the eyepiece is worth two in the Atlas.