January 24, 2011
The Hubble Space Telescope’s 7.9-foot-diameter (2.4 meters) primary mirror remains remarkably robust and resilient. Astronomers have not measured any degradation in the amount of light the telescope collects and sends to its onboard instruments.
The Hubble Space Telescope floats against the background of Earth.
Photo by NASA
That said, the mirror has probably undergone micrometeorite erosion, but there is no direct way to measure the amount of “pitting.”
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