Mars thought experiments
One of the questions that the Mars
Rovers is trying to answer --- and
other missions have tried to answer
also --- is "Could conditions on
Mars be or ever have been suitable
to support life?"
An important related question is this:
Under what conditions can life exist?
There is no particular reason to believe
that only Earth-like conditions
can support life ... or is there?
Mars Pathfinder mission --
http://photojournal.jpl.nasa.gov
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