Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. E.T., Stitch, Chewbacca, ...

E.T., Stitch, Chewbacca, Groot — humans have a lot of ideas about what aliens might look like. But what is the science behind extraterrestrial life? Is it possible that humans will ever experience ...