Manned vs. unmanned space missions

    Aug. 14, 2008
    I was reading about NASA's latest Mars missions today and remembered a pair of columns John Keller and I wrote back in 2003 on manned vs. unmanned space flight.

    I was reading about NASA's latest Mars missions today and remembered a pair of columns John Keller and I wrote back in 2003 on manned vs. unmanned space flight.

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