The James Webb telescope is on track for a planned launch in the year 2013.
you can get the optical components to repair an old telescope at http://www.astromart.com/classifieds/details.asp?classified_id=644695. Another site is www.Fixya.com/Telescope+Repair
The Hubble Space Telescope is repaired by sending Space Shuttle missions to it. Astronauts conduct repairs, upgrades, and maintenance tasks during these missions. They replace faulty components, install new instruments, and perform tests to ensure the telescope's functionality.
Disadvantages Harder to operate in space more expensive you can't get such a large telescope. it's harder to repair a Hubble telescope
The Space Shuttle Endeavour was used to repair the Hubble Space Telescope in 1993 during the STS-61 mission. The crew installed corrective optics to fix the telescope's flawed vision.
The James Webb Space Telescope (JWST) is the planned successor of the HST and the Spitzer Space Telescope (for observations in infrared). It will have a diameter of 6.5 m (the HST has 2.4 m). As of now, the launch will be in 2017 or 2018.
five space walks by astronauts
Atlantis launch to repair the Hubble Telescope, STM-125
STS-61 in December 1993 carried out the $629 million repair to the optics of the Hubble Space Telescope, which had been incorrectly ground. There have been other servicing and repair missions. In February 1997, a parts installation mission was carried out, in December 1999, further repairs were undertaken, and in March 2002, more components were installed. A subsequent mission was planned for 2004, but was postponed due to safety concerns following the Columbia shuttle disaster. This mission is now scheduled for September 2008.
The Hubble telescope was launched in 1990, but faulty optics limited its use until a shuttle mission made repairs in 1993. Other servicing missions improved its onboard instruments. It will be mostly superseded by the James Webb Space Telescope planned for launch around 2018.
A planned or unplanned repair on any machine to maintain its efficiency or performance.
The best known Hubble repair mission was to install a fix to some flawed optics aboard the telescope. Other missions have been to replace other aging hardware and install more capable equipment for more advanced research.