Earth's unusual orbit through hot and cold conditions tests the limits of tolerability for any known lifeforms.
New research points toward an exoplanet that may be capable of supporting life 20 light-years away from Earth.
Here are some pics of most earth-like exoplanets uploaded by NASA: Gliese 667Cc, 22 light-years from Earth, is 4.5 times Earth's mass, orbits its cooler red dwarf star in 28 days, and likely resides ...
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