ALIEN EARTHS (PB)

We’ve asked the question for generations, and we now have the technology. But once you try to find life elsewhere in the universe, it’s not so simple. How do you search over cosmic distances? What are you looking for? What, actually, is life? Founding director of Cornell University's Carl Sagan Institute, astrophysicist Lisa Kaltenegger, demonstrates how we can use our homeworld as a Rosetta Stone in this search, and reveals exoplanets covered in oceans of lava, lonely wanderers lost in space, planets with more than one sun, and the best contenders for Alien Earths.