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Working on Hubble’s Main Mirror (1990)
Workers study Hubble's main, eight-foot (2.4 m) mirror. Hubble, like all telescopes, plays a kind of pinball game with light to force it to go where scientists need it to go. When light enters Hubble, it reflects off the main mirror and strikes a second, smaller mirror. The light bounces back again, this time through a two-foot (0.6 m) hole in the center of the main mirror, beyond which Hubble’s science instruments wait to capture it. In this photo, the hole is covered up.
- Release DateDecember 24, 1990
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Last Updated
Mar 27, 2025
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Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov