Massive 'Waterworld' Discovered in Space, Presence of Kevin Costner Unconfirmed 3.68K Adrian Chen 12/16/09 09:41PM Filed to: Science Science Astronomy Waterworld Kevin Costner Astronomers have found a planet around six-and-a-half times the size of Earth, which they believe has abundant liquid water. It's one of the most Earth-like planets discovered yet, and it's a mere 40 light-years away. Road trip! [MSNBC]