Former NASA astronaut Mark Kelly, fourth from right, and Dr. Jill Biden, wife of Vice President Joe Biden, third from right, list to a student from Clear Creek Independent School District about the school's robotic competition team, Wednesday, March 2, 2016 during a tour of the Space Vehicle Mockup Facility at 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, houston, jill, johnson, kell, kelly, mark, nasa, space, texas, tx