The Hubble Space Telescope turns 25!

STS-31 lifts off, carrying Hubble into orbit. Source

Launched on 24 April 1990, Hubble will mark it's 25th anniversary on April 24. It is one of the greatest scientific instrument ever made helping humans to unlock the biggest mysterious of our universe. 

The HST was built by the United States space agency NASA, with contributions from the European Space Agency

Hubble was planned to be launched in 1983 but Technical problems, budget problems, and the challenger disaster delayed the launch to 1990. After launching on 24 April a big problem was detected in the telescope, The main mirror was found to have been ground incorrectly, compromising the telescope's capabilities. The optics were corrected to their intended quality by a servicing mission in 1993.

Hubble is the only telescope designed to be serviced in space by astronauts. After launch by Space Shuttle Discovery in 1990, four subsequent Space Shuttle missions repaired, upgraded, and replaced systems on the telescope. A fifth mission was cancelled because of columbia disaster. However, after spirited public discussion, NASA administrator Mike Griffin approved one final servicing mission, completed in 2009.

Hubble as seen from Discovery during its second servicing mission. Source

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Impact on Astronomy!

Hubble Telescope changed the way we used to see the space, After its launch Hubble started observing the space and sent back  the first image it took.

The first image hubble took! Source

This is the image of the stars in the Carina cluster! The left image is from Ground - based observatories and the next one is from Hubble Space Telescope. The image came not what was expected it to be, The Main mirror was found to have been ground incorrectly, this problem was fixed by a servicing mission in 1993.

The telescope is still operating as of 2015, and may last until 2020. Its scientific successor, the James Webb Space Telescope (JWST), is scheduled for launch in 2018.

Watch Hubble in IMAX narrated by leonardo dicarpio! My fav Hubble Documentary.

IMAX: Hubble

Hubble and JWST mirrors (4.5 m2and 25 m2 respectively) Source
Evolution of detecting the early Universe Source
The Above image shows how deep we can look in space, Currently we can look back to about 10 Redshift. The new telescope will exceed this to 20.