NASA Photo ID: STS75351037          File Name: 75351037.jpg 

 
 

Description: 
  Astronauts Jeffrey A. Hoffman (left) and
   Franklin R. Chang-Diaz hold up a sign to
   celebrate the fact that each has surpassed the
   1,000-hour mark in space during the flight.  The
   two mission specialists joined three other
   astronauts and an international payload
   specialist for 16 days of scientific research
   aboard the Space Shuttle Columbia.
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