Twenty years ago NASA launched the Hubble Space Telescope. The lead astrophysicist on the history of the Hubble, how it has forever changed our view of the universe and why he believes there’s life beyond Earth.
- Edward Weiler An astrophysicist and leading scientist at NASA. He served as chief scientist of the Hubble Space Telescope from 1979-1998. Currently he is the associate administrator for NASA's Science Mission Directorate. He is the author of "Hubble: A Journey Through Space and Time."