Proof of ice on Mars

Ice on Mars! Now you see it, now you don’t

The scientists behind NASA’s Phoenix Mars Lander mission now know that they had their first close-up look at Martian ice — because it has vanished from the picture.

Days ago, streaks and bits of whitish material were spotted at the bottom of a trench dug by the lander's robotic scoop, leading scientists to speculate that the stuff was either ice or salt. An initial chemical analysis was inconclusive, but scientists said they could tell by seeing if the material disappeared after exposure to the thin Martian atmosphere. (Source: MSNBC)

I can't say I understand all the details, but in essence, if there is provable water on Mars, then it's possible there was or has been life at some point. Do you think that life on Mars was or is possible?