It's an age-old question: are we alone? Or do other lifeformsand intelligences thrive on worlds far beyond our own?Ultra-sensitive telescopes and dogged detective work aretransforming alien planet-hunting from science fiction intohard fact. Join NOVA on a visit to exotic worlds orbitingdistant suns, from puffy planets with the density of Styrofoamto thousand-degree, broiling gas giants. Most tantalizing ofall are the Super-Earths in the "Goldilocks zone," just theright distance from their sun to support life, and with one ofthem signaling life's essential ingredient, water, in itsatmosphere. Are we on the brink of answering that hauntingquestion?
