Top astronomers who have worked on the Hubble Space Telescope over the past 20 years talk about their major discoveries that were made possible only with a spaceborne observatory. The 12-minute look at Hubble's top findings includes: galaxy evolution, dark matter, the age of the universe, black holes, extrasolar planets, and dark energy.

Credit: NASA and M. Estacion (STScI)

Publication: April 22, 2010