Fun fact 12/03/2016

Just after launch, it was discovered that the Hubble spacecraft suffered from an optical defect called spherical aberration, which was caused by the malfunction of a measuring device used during the polishing of the mirror. As a result, Hubble could not achieve the best possible image quality…so they gave Hubble corrective lenses during the first Hubble Servicing Mission in December 1993.

http://www.spacetelescope.org/about/history/aberration_problem/

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