A group of astronomers from MIT, NASA and several other institutions announced today that they've discovered three Earth-like planets, which are orbiting a nearby star, and they have the potential for both water and life. The biggest news? They're a mere 40-light years from Earth. Sky & Telescope's J. Kelly Beatty (@NightSkyGuy) joined Jim to discuss this out-of-this world discovery, which is once again raising hopes of life beyond the planet Earth. 

You can watch Mercury in transit here