Are there aliens in our backyard? Some reputable scientists think there might be. Not the green, bug-eyed critters from countless UFO believers' imaginations. But life nonetheless. National Geographic takes you into the high-tech world of SETI - the Search for Extra-Terrestrial Intelligence, where astronomers, astrophysicists and astrobiologists are seeking out new forms of life in the far reaches of space - and closer to home. We visit the seven places in our own solar system where scientists think alien life may be lurking. With 3D CGI rendering of each world in breathtaking detail, we imagine what such life would look life, and how it would survive. And we highlight the innovative ways scientists are searching - from mega-satellite arrays in the Puerto Rican jungle, to enormous radio telescopes listening for strange signals, to NASA's amazing orbiters like Voyager, Huygens, and Cassini, that have captured images and data of nearby planets and moons that are truly out of this world. Stargazers have been seeking life in the heavens for thousands of years, but only now is technology advanced enough to have a chance of actually finding it. We quickly, and entertainingly, chronicle the history of the search for extraterrestrial life - from Italian astronomer Giovanni Schiaparelli who discovered the famous Martian "canals" in 1887, to the 1977 intergalactic postcard emblazoned on the side of the Voyager probe, designed for alien eyes!