Possibly Once-habitable Ancient Martian Lake Discovered

ScienceDaily (Mar. 6, 2008) — Scientists studying images from The University of Arizona-led High Resolution Imaging Experiment camera on NASA's Mars Reconnaissance Orbiter have discovered never-before-seen impact "megabreccia" and a possibly once-habitable ancient lake on Mars at a place called Holden crater.

My question is, why do they think it was once habitable when so far according to NASA they haven't found any evidence of life past or present on mars yet?

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reply to post by maxseamus


They don't think it was habitable, what Alfred McEwen said was:

Both contain minerals that formed in the presence of water and mark potentially habitable environments.

Saying it was potentially habitable is not the same thing as saying it was.