The Most Earth-like Alien World

Eight new planets were recently picked up by NASA’s Kepler Space Telescope, with one in particular, the Kepler 438b, being described as the most Earth-like planet to date. SETI Institute’s Kepler Instrument Scientist Dr. Douglas Caldwell joins us from NASA’s Ames Research Center in California to explain the implication of this discovery and whether earth-like necessarily means habitable to life.