Meandering rivers have been spotted on the Martian surface --
but they are now dry ridges, an eerie reminder of Mars' wet past.
In a recently-released view of the beautiful Trifid Nebula,
NASA's Wide-field Infrared Survey Explorer (WISE) takes an intimate look
into the effects of star birth inside the cloud of dust and gas.
Earth may be a nice and cozy place for life as we know it to
evolve, but is it really the best place for life to thrive? Probably
not, say two researchers.
Early planets may have harbored microbial life just after the
universe started, warmed by cosmic radiation, says a new theory.
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