Hubble Space deployment:

HUBBLE SPACE DEPLOYMENT:

The Hubble Space Telescope was deployed from the Space shuttle Discovery during STS-31 on April 25, 1990. since then, there have been 5 servicing missions continued to upgrade the telescope's scientific instruments and operational systems.

MISSION 1:

As the first ina aseries of planned vivsits to the Hubble Space Telescope, the first Servicing Mission (STS-61) IN December 1993, had a lot to prove and a lot to do. The mission's most important objective was to install two devices to fix Hubble's vision problem.

MISSION 2: 

The light from the most distant galaxies is shifted to infrared wavelengths by the expanding universe. To see these galaxies, Hubble needed to be shiffted with an instrument that could observe infrared light.

MISSION 3A:
On Decemeber 19, 1999, seven astronauts boarded the space shuttle Discovery to pay the Hubble Space Telescope a special holiday visit.Afetr a successful launch and several trips around Earth, the crew caught up with Hubble and hauled in into the shuttle cargo bay. Six days and three 6 hours spacewalks later, the crew has successfully completed Part A of the two parts Third Servicing mission , which had them replacing worn and outdated equipment and performing several critical maintenance upgrades.

MISSION 3B:
On March 1, 2002, NASA launched the space shuttle Columbia into an orbit 360 miles above the Earth, where its seven-member crew met with the Hubble Space Telescope to perform a series of upgrades Servicing Mission 3B also known as STS-109, was the fourth visit to Hubble NASA  divided the original Servicing Mission 3 into two parts and conduced the first part-Servicing Mission 3A- in December 1999.

MISSION 4:
Servicing Mission 4 (SM4),lauched on May 11, 2009, was the summit of a long effort to provide the telescope with one more servicing mission.
Originally organized for 2004, SM4 was postponed and then cancelled after the loss of the successful improvement of the shuttle program and are examination os SM4 risks, NASA approved another mission. SM4, also known as STS-125, was maybe Hubble's most challenging and intense servicing mission, with a multitude of work to be completed over the course of five spacewalks.

source:
 http://hubblesite.org/the_telescope/team_hubble/servicing_missions.php