What planets can people live on? You might be happy to learn that 8. 8 billion Earth-sized planets have been discovered so far. Over 30 of those planets in our Milky Way galaxy are very likely to be habitable to human being. Scientific teams have been hard at work trying to discover habitable planets. We dont know if any of those planets hold extraterrestrial life, but well worry about that when we get there! Date: 2022-04-19