when was the hubble space telescope launched by space shuttle discovery
Hubble Space Telescope Hubble is the only telescope designed to be serviced in space by astronauts. After launch by Space Shuttle Discovery in 1990, five subsequent Space Shuttle missions repaired, upgraded, and replaced systems on the telescope, including all five of the main instruments. The fifth mission was initially canceled on safety grounds following the Columbia disaster (2003). However, after spirited public discussion, NASA administrator Mike Griffin approved the fifth servicing mission, completed in 2009. The telescope is operating as of 2018[update], and could last until 2030â€“2040.[3] Its scientific successor, the James Webb Space Telescope (JWST), is scheduled for launch in March 2021.[8]
Hubble Space Telescope Hubble orbits the Earth in the extremely tenuous upper atmosphere, and over time its orbit decays due to drag. If it is not re-boosted, it will re-enter the Earth's atmosphere within some decades, with the exact date depending on how active the Sun is and its impact on the upper atmosphere. If Hubble were to descend in a completely uncontrolled re-entry, parts of the main mirror and its support structure would probably survive, leaving the potential for damage or even human fatalities.[179] In 2013, deputy project manager James Jeletic projected that Hubble could survive into the 2020s.[3] Based on solar activity and atmospheric drag, or lack thereof, a natural atmospheric reentry for Hubble will occur between 2028 and 2040.[3][180] In June 2016, NASA extended the service contract for Hubble until June 2021.[181]
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