The Hubble Space Telescope is one of the greatest technological achievements in our history, and for two decades has astonished us with dynamic images of our solar system and the world beyond. To celebrate this important twenty-year milestone, NASA looks back at the contributions of this extraordinary scientific tool, and the scientists who created it, in a documentary entitled "Hubble: Twenty Years of Discovery." The movie is narrated by Brent Spiner, Data from Star Trek.