The "Star Wars" Worlds: More Science Than Fiction?

"Everyone knows the Star Wars galaxy is located "far, far away." But how realistic are the alien worlds (see pictures) described in the science fiction saga? To find out, National Geographic News checked in with two experts on everything extraterrestrial: Bruce Betts, a planetary scientist at the Planetary Society in Pasadena, California, and Seth Shostak, a senior astronomer at the SETI (Search for Extraterrestrial Intelligence) Institute in Mountain View, California." Source: National Geographic