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The seven crew members of Space Shuttle Discovery mission STS-103 ((front, from left) Swiss ESA astronaut Claude Nicollier, American NASA astronaut Scott J Kelly, American NASA astronaut John M Grunsfeld, (back, from left) American NASA astronaut Steven L Smith, British-American NASA astronaut C Michael Foale, American NASA astronaut Curtis L Brown, Jr, and French ESA astronaut Jean-Francois Clervoy) pose for the traditional inflight crew portrait, 20th-28th December 1999. STS-103 is NASA's third servicing visit to the Hubble Space Telescope (HST). (Photo by Space Frontiers/Archive Photos/Hulton Archive/Getty Images)