1. Mars Lakes

    Nathalie Cabrol, who has spent many long hours poring over images of Mars taken from orbiting spacecraft, believes those images contain convincing evidence that lakes were present on Mars in the recent past.

    “Recent” requires some definition when you’re talking to geologists. In this case, it means some time in the past half a billion years or so, give or take a couple hundred million. There are no lakes present on the Martian surface today.

    Cabrol, a member of the NASA Astrobiology Institute (NAI) and a principal investigator with the SETI Institute, works at NASA’s Ames Research Center in ...

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