Did small life forms called microbes ever thrive on Mars? Do they today? If you have questions about Mars as habitat for microbial life, here's the place. (Ask about aliens in Pop Culture Mars.)
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Does the methane detected on Mars indicate that there is life on the planet? What are other sources of methane, besides biological?
Mars may have been much like Earth 4 billion years ago, then its core cooled down and it lost its magnetic field. Earth may have been much like Venus is today (I think) . Do you think Venus will cool down and be the next earth in , say, 2 billion years?
