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IN SPACE - MAY 17: In this handout from NASA, Astronauts Michael Good (L) and Mike Massimino, both STS-125 mission specialists, participate in the mission's fourth spacewalk to repair the Hubble Space Telescope May 17, 2009 in Space. The space shuttle Atlantis' mission is to overhaul the Hubble Space Telescope in order to extend its working life. (Photo NASA via Getty Images)

IN SPACE - MAY 17:  In this handout from NASA, Astronauts Michael Good (L) and Mike Massimino, both STS-125 mission specialists, participate in the mission's fourth spacewalk to repair the Hubble Space Telescope May 17, 2009 in Space. The space shuttle Atlantis' mission is to overhaul the Hubble Space Telescope in order to extend its working life.  (Photo NASA via Getty Images)