Astronomers have discovered a previously unknown ancient crater lake on Mars, in a recent study.
In a study published in Planetary Science Journal, a team led by researchers from Brown University in the US describe an as-yet to be unnamed crater with some puzzling characteristics. The crater's floor has unmistakable geologic evidence of ancient stream beds and ponds, yet there's no evidence of inlet channels where water could have entered the crater from outside, and no evidence of groundwater activity where it could have bubbled up from below.