Penn State Professor Joel Leja tackles questions about astronomy, space, astrophysics, and aliens. 👽 00:31 - What does it mean for the universe to have an "edge"? Is it infinite? 01:15 - Has the universe actually gotten *smaller*? 02:45 - How far away is any given object in the universe? 03:50 - "You gotta ask the alien question..." Leja describes the observable "edge" of the universe, and how we measure both the speed of light and the distance light can travel. As life on Earth has evolved, humanity has often wondered about the possible development of alien civilizations. While it's hard to imagine that we are the only planet on which life exists, Leja remarks that we haven't yet received clear messages from aliens. ========================================================== Joel Leja is an associate professor of astronomy & astrophysics at The Pennsylvania State University. He holds the Dr. Keiko Miwa Ross Mid-Career endowed chair. His research focuses on understanding the proc...