A computer model of the formation of Olympus Mons (a big giant mountain on Mars) indicates that this geological formation should contain pockets of water.
The scientists explained that their finding is more implication than revelation. “What we were analyzing was the structure of Olympus Mons, why it’s shaped the way it is,” said McGovern, an adjunct assistant professor of Earth science and staff scientist at the NASA-affiliated Lunar and Planetary Institute. “What we found has implications for life – but implications are what go at the end of a paper.”
This water would be liquid. Warm, in fact. And thus, the prospect of life.
I’m going off a press report here, but it sounds interesting. The paper was published in Geology, and at the moment I’m having a bit of trouble getting a copy of it. More later, maybe.