Hold on - there may be life on Mars. We don't yet know for certain that there isn't.
Right now, life as we know it would not survive anywhere except Earth or Mars, and possibly Europa (in our solar system).
Life requires liquid water. Europa
(one of Jupiter's moons) has a muck of mud some
hundreds of kilometers below the ice that has
water in it, and there might be life there.
Equatorial regions of Mars get above freezing for
parts of the year, and while the Martian
atmosphere is too thin to sustain liquid water on
the surface, the pressure is great enough
underground, and muddy slurries of landslides from
subsurface water have been observed. Earth of
course has oceans of the stuff. It all has to do
with pressure and temperature for water. Now,
whether there is life there or not, that we aren't sure of.
Life is only found on Earth for a couple of
reasons. We know that life requires sun, moderate
temperatures, water, and certain chemical elements
like carbon, oxygen, and nitrogen. No other
planet has temperatures like Earth that are not
too hot and not too cold. Also, no other planet has water like Earth has.
Scientists have found that other planets have ice but no liquid water. Finally, Earth has the right mix of chemicals that are required for life.
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