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Who actually repaired Hubble?

No, Virginia, COSTAR did not fix Hubble.
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In John Ford’s classic 1962 Western, The Man Who Shot Liberty Valance, Jimmy Stewart plays Ransom Stoddard, a senator and former governor who owes his career to the moment when, as a young lawyer, he shot the villainous Liberty Valance. Of course, Stoddard did not pull the trigger at all; Tom Doniphon (John Wayne), a local rancher, did. A reporter, upon learning the truth late in Stoddard’s life, throws his notes in the fire and utters the famous words, “When the legend becomes truth, print the legend.” 

Astronomy has its own Man Who Shot Liberty Valance. It is the Corrective Optics Space Telescope Axial Replacement, or COSTAR. As most readers of Astronomy surely know, when the Hubble Space Telescope was launched, its mirror was badly flawed, turning the mission into what arguably would have been the most spectacular failure in the history of science.

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