As earthbound scientists and astronomers continue their search for habitable planets throughout the galaxy, they found what they think could be a possible waterworld.  The planet called Gliese 581 C is located outside of our solar system at about 20.5 light-years away.  A light-year is the distance traveled by light in one year, exactly 9,460,730,472,580.8 kilometers away.  It also is the smallest extrasolar planet (or exoplanet) discovered so far.

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