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It’s been known for some time that liquid water could exist under the Martian surface. Heat from the Martian interior bubbles up, and warmth from the sunlit surface works its way down. Depending on the thermal gradient (how the temperature changes with depth, which depends on the material), this means that in some places on Mars the temperature allows for water ice to melt. In general, it’s about 1 – 2 kilometers deep.
Years ago it was thought that the SPLD was too thin to have liquid water under it, but then MARSIS mapped the region (called Planum Australe, or southern plains) and showed it’s actually up to 3.7 kilometers thick in places!
originally posted by: BlackProject
a reply to: sapien82
It seems that there is some kind of push to not discuss such findings, as to not cause concern to those of both religious beliefs.
I think that NASA have known about this for longer then this, they tested the public recently by saying they found carbon and I can guarantee you that they really wanted to say we found this, huge supply of water.