I'm an ex-NASA scientist - these are the planets where alien life really could exist

A water world ruled by octopus-like creatures. A planet divided by light and dark where the sun never rises. These are not descriptions of foreign worlds in science fiction novels, these are some of the'exoplanets' most likely to be harboring aliens right now. Dozens of these exoplanets - planets that orbit stars outside our solar system - which have been classified as'potentially habitable' or'Earth-like' have been documented in tantalizing detail in a new book. Humanity is in a'new golden era of exploration,' according to Dr. Lisa Kaltenegger, whose new book explores what science now knows about how distant worlds in our galaxy could support life.