Hubble Space Telescope - Research Article from Macmillan Science Library: Space Sciences

This encyclopedia article consists of approximately 9 pages of information about Hubble Space Telescope.
This section contains 2,555 words
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Launch and Servicing Missions

The HST was launched by the space shuttle Discovery on April 24, 1990. Hubble initially was equipped with five science instruments: the Wide-Field Planetary Camera, the Faint Object Camera, the Faint Object Spectrograph, the High-Resolution Spectrograph, and the High-Speed Photometer. In addition, Hubble was fitted with three fine guidance sensors used for pointing the telescope and for doing precision astrometry—the measurement of small angles on the sky.

After Hubble was launched, scientists discovered that its primary mirror was misshapen because of a fabrication error. This resulted in spherical aberration: the blurring of starlight because the telescope could not bring all the light to a single focus. Using image-processing techniques to reduce the blurring in HST images, scientists were able to do significant research with Hubble until an optical repair could be developed.

In December 1993, the first HST servicing mission carried replacement instruments and...

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This section contains 2,555 words
(approx. 9 pages at 300 words per page)
Buy the Hubble Space Telescope Encyclopedia Article
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Macmillan Science Library: Space Sciences
Hubble Space Telescope from Macmillan Science Library: Space Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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