The mirror was precisely polished "to spec" with custom-built equipment that was assembled incorrectly. They correctly saw the distortion issue on the ground wi

The mirror was precisely polished "to spec" with custom-built equipment that was assembled incorrectly. They correctly saw the distortion issue on the ground with the conventional kit, but rejected the result as erroneous because it tested fine with the "better" testing equipment. https://en.wikipedia.org/wiki/Hubble_Space_Telescope#Origin_of_the_problem https://en.wikipedia.org/wiki/Hubble_Space_Telescope#Origin_...