7 astronauts flew to space to repair NASA telescope 25 yrs ago
During the week of December 6, 1993, seven NASA astronauts went to space to fix errors on Hubble Space Telescope's primary mirror which was leading to blurry images. The astronauts, during five spacewalks, fixed solar arrays and installed the Wide Field and Planetary Camera 2. The camera helped Hubble again in 2007 when an advanced camera on the telescope failed.