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Five-time shuttle astronaut Robert "Hoot"; Gibson stands near a candle honoring fallen astronauts during a remembrance ceremony honoring astronauts killed in three accidents plus 40 others who were part of the astronaut corps and have died, Thursday, Jan. 29, 2015, at Marshall Space Flight Center in Huntsville, Ala.  (AP Photo/Jay Reeves)

Five-time shuttle astronaut Robert "Hoot"; Gibson stands near a candle honoring fallen astronauts during a remembrance ceremony honoring astronauts killed in three accidents plus 40 others who were part of the astronaut corps and have died, Thursday, Jan. 29, 2015, at Marshall Space Flight Center in Huntsville, Ala. (AP Photo/Jay Reeves)

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