Launched in 1990 and greatly extended in its scientific powers through new instrumentation installed during four servicing missions with the Space Shuttle, the Hubble telescope is getting ready for its last upgrade.

Hubble has contributed much to our understanding of the universe. Here's some of the highlights.

In this new Hubblecast episode, Dr. J guides us through the sixth chapter of Eyes on the Skies, the International Astronomical Union's movie celebrating the telescope on its 400th anniversary in 2009.

Expanding the frontiers of the visible Universe, Hubble looks deep into space with cameras that can see across the spectrum of infrared to ultraviolet light.

Dr. Heidi Hammel relates the public's interest in saving the Hubble Telecope and the upcoming servicing mission.