AdvertisementAge Of Innocence: How Discovering Planets Is Like Losing Your VirginityOctober 05, 2010Adam FrankfacebookEmailA National Science Foundation artist's drawing shows the inner four planets orbiting Gliese 581, a red dwarf star just 20 light-years from Earth. The newly discovered planet, in the foreground, has a 37-day orbit and, like Earth, is distant enough from the star for liquid water to exist.