Ellen Ochoa, director, NASA's Johnson Space Center, left, Norm Knight, chief, Flight Director Office, center, and Dr. Jill Biden, wife of Vice President Joe Biden, left, are seen in the International Space Station Flight Control Room, Wednesday, March 2, 2016 during a tour of NASA's Johnson Space Center in Houston, Texas. Dr. Biden traveled to Houston to welcome home astronaut Scott Kelly, who is returning to Houston after a year long mission aboard the International Space Station.

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Keywords: ., biden, center, centers, christopher, control, ellen, houston, jill, johnson, jr., knight, kraft, mission, nasa, norm, ochoa, space, texas, tx