NASA launches Endeavour's final flight
24 of 25 from NASA's Endeavour on cusp of final flight (photos)
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Within weeks of the launch of the Hubble Space Telescope in 1990, images showed that there was a serious problem with the optical system. The primary mirror had been ground to the wrong shape, resulting in image quality that was drastically lower than expected. Here, astronauts work on installing Hubble's corrective optics during STS-61 Servicing Mission 1.
April 29, 2011 4:00 AM PDT
Photo by: NASA
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