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The Hubble Space Telescope went into space in April 1990 . Scientists waited for its first pictures . When the pictures arrived , they were blurry . Engineers studied the problem carefully . They found that the main mirror was wrong . It had been ground to the wrong shape . It was about one - fiftieth the width of a human hair . But in space , tiny errors matter a lot . NASA decided to fix the telescope in orbit . Hubble was built so that astronauts could fix it . In December 1993 , astronauts flew up to Hubble . They worked outside the spacecraft five times . Each spacewalk was long and difficult . The astronauts fitted special corrective mirrors . These mirrors worked like glasses for the telescope . Then the new pictures arrived . They were sharp and clear . Hubble could now see galaxies billions of light - years away . A mirror ground wrong by a tiny fraction had nearly ended the mission . A daring repair saved it . Hubble went on to become one of the most important telescopes in history . It showed us the age of the universe . It showed us how galaxies are born . One small flaw , caught and fixed , changed everything .
