The large and dusty planet Tatooine is the fictional home of Anakin and Luke Skywalker in the Star Wars sci-fi saga.
"You can develop a really arid world, like Mars, but once it is mostly arid, it is hard to keep any liquid water," said Bruce Betts, a scientist at the Planetary Society in Pasadena, California, and an expert on things extraterrestrial. "Liquid water is one of three things needed for life on Earth, so it's probably not a terrible assumption to make that it's needed for life elsewhere too."