Breaking space news, the latest updates on rocket launches, skywatching events and more! You are now subscribed Your newsletter sign-up was successful Want to add more newsletters? Astronomers have narrowed the search for extraterrestrial life from thousands of distant worlds down to just a few dozen promising candidate planets, offering a clearer roadmap for one of science's biggest questions: Are we alone? In a new study, a team of researchers led by Lisa Kaltenegger of the Carl Sagan Institute at Cornell University identified 45 rocky exoplanets that sit within their stars' habitable zones, where temperatures could allow liquid water to exist on their surfaces. Out of more than 6,000 known exoplanets, these worlds represent some of the most compelling places to search for alien life.…