With a mass of 11 tons and 43 feet (13.2 m) long, the Hubble Space Telescope has been peering into the depths of the universe since 1990. Here's its seen in February 1997, during the second of five Space Shuttle servicing missions.
Liftoff! The Space Shuttle Discovery soars skyward on April 24, 1990. Squeezed in its cargo bay is a precious payload: the Hubble Space Telescope.
Astronauts John Grunsfeld (left) and Richard Linnehan work to replace the Hubble Space Telescope's power control unit during a March 6th space walk. One of the orbiting observatory's new solar-cell arrays, installed earlier in the week, looms at right.