NASA feature:
http://www.nasa.gov/mission_pages/hubbl ... ature.html
Hubble Celebrates 20 Years of Astonishing Discoveries
"Space shuttle Discovery roared into orbit April 24, 1990, with a most precious cargo, NASA's Hubble Space Telescope. In the two decades since, teams of astronauts working from other shuttles repaired the orbiting eye on the universe and extended its abilities far beyond what was thought possible for longer than many thought realistic.
Hubble, named for groundbreaking astronomer Edwin Hubble, repaid the commitment with some of the most dazzling images the world has seen, along with fresh data that answered a wealth of questions and led to many new ones. The telescope's observations allowed astronomers to set the age of the universe at about 13.7 billion years with a high degree of certainty.
"I never believed in 1990 that the Hubble would end up this great," said Ed Weiler, NASA associate administrator for the Science Mission Directorate and chief scientist for the Hubble program when it launched. "It's changed a lot of thinking and it's changed a lot of what I learned 30 years ago in grad school."
Hubble's discoveries stretch over most aspects of astronomy, but its highlights include proving massive black holes exist and defining the age of the universe. It also proved the existence of something no one has seen -- dark energy.
"Nobody ever knew it existed before Hubble," said Jon Grunsfeld, an astronaut and astronomer who worked on Hubble during two shuttle missions...."
20th Anniversery Images:
http://www.nasa.gov/mission_pages/hubbl ... h-img.html
Interactive Feature:
http://www.nasa.gov/externalflash/Hubble20/