Difference between revisions of "Hubble Space Telescope"
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Revision as of 10:40, 28 November 2012
The Hubble Space Telescope is the visible/ultraviolet/near-infrared element of the Great Observatories astronomical program. The spacecraft provides an order of magnitude better resolution than is capable from ground-based telescopes. The objectives of the HST are to:
- Investigate the composition, physical characteristics, and dynamics of celestial bodies;
- Examine the formation, structure, and evolution of stars and galaxies;
- Study the history and evolution of the universe;
- Provide a long-term space-based research facility for optical astronomy.
During initial on-orbit checkout of the Hubble's systems, a flaw in the telescope's main reflective mirror was found that prevented perfect focus of the incoming light. This flaw was caused by the incorrect adjustment of a testing device used in building the mirror. Fortunately, however, Hubble was designed for regular on-orbit maintenance by Space Shuttle missions. The first servicing mission, STS-61 in December 1993, fully corrected the problem by installing a corrective optics package and upgraded instruments (as well as replacing other satellite components). A second servicing mission, scheduled for March 1997, installed two new instruments in the observatory.