File:Hubble mirror polishing.jpg

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English: Hubble Space Telescope Primary Mirror: This photograph shows the Hubble Space Telescope's (HST's) Primary Mirror being ground at the Perkin-Elmer Corporation's large optics fabrication facility. After the 8-foot diameter mirror was ground to shape and polished, the glass surface was coated with a reflective layer of aluminum and a protective layer of magnesium fluoride, 0.1- and 0.025-micrometers thick, respectively. The purpose of the HST, the most complex and sensitive optical telescope ever made, is to study the cosmos from a low-Earth orbit. By placing the telescope in space, astronomers are able to collect data that is free of the Earth's atmosphere. The Marshall Space Flight Center had responsibility for design, development, and construction of the HST and the Perkin-Elmer Corporation, in Danbury, Connecticut, developed the optical system and guidance sensors.
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Source NASA Marshall Space Flight Center Collection (NIX MSFC-7995584)
Author NASA Marshall Space Flight Center
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(Reusing this file)		 NASA

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Date/TimeThumbnailDimensionsUserComment
current22:51, 6 June 2020Thumbnail for version as of 22:51, 6 June 20203,000 × 2,401 (1.29 MB)TD-Linux (talk | contribs)Reverted to version as of 14:44, 3 February 2011 (UTC) (previous revert seemed to be a mistake - this version matches https://www.nasa.gov/sites/default/files/thumbnails/image/1979_hst_primary_mirror.jpg)
09:21, 20 September 2019Thumbnail for version as of 09:21, 20 September 2019439 × 324 (36 KB)Martinlisa4828 (talk | contribs)Reverted to version as of 14:45, 6 April 2007 (UTC)
14:44, 3 February 2011Thumbnail for version as of 14:44, 3 February 20113,000 × 2,401 (1.29 MB)AtomCrusher (talk | contribs)Colour original res.
08:12, 5 February 2009Thumbnail for version as of 08:12, 5 February 2009256 × 194 (35 KB)Lycaon (talk | contribs)was upscaled
14:45, 6 April 2007Thumbnail for version as of 14:45, 6 April 2007439 × 324 (36 KB)Levg (talk | contribs){{Information |Description= Polishing of Hubble's primary mirror begins. |Source= http://history.msfc.nasa.gov/book/chpttwelve.pdf |Date= May 1979 |Author= |Permission= |other_versions= }}

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