http://video.foxnews.com/v/43702344...twin/?playlist_id=1821663211001#sp=show-clips NASA may have found Earths twin. :D It took 6 years.
Technically, Venus is supposed to be Earth's twin, as it is speculated by astronomers that Venus was once like Earth, but the extreme number of volcanoes gave off greenhouse gases and a huge amount of Carbon Dioxide and Sulfur Dioxide, causing Venus to be the way it is now and annihilating all life that once lived there.