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[[Image:HST.jpg|200px|thumb|right|Hubble Space Telescope]]
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The Hubble Space Telescope is the visible/ultraviolet/near-infrared element of the Great Observatories
The '''Hubble Space Telescope''' is the visible/ultraviolet/near-infrared element of the [[Great Observatories]]
 
 
astronomical program.  
 
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:
 
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;  
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1) Investigate the composition, physical characteristics, and dynamics of celestial bodies;  
# Examine the formation, structure, and evolution of stars and galaxies;  
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2) Examine the formation, structure, and evolution of stars and galaxies;  
# Study the history and evolution of the universe;  
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3) Study the history and evolution of the universe;  
# Provide a long-term space-based research facility for optical astronomy.  
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4) 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.
 
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.
 
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.
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Fortunately, however, Hubble was designed for regular on-orbit maintenance by 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.
 
 
[[Category: Articles]]
 
[[Category:Historic spacecraft]]
 
[[Category:Vessels of Orbiter]]
 

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