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Photo by: Lauren Harnett

FILE - In this April 8, 2010 file picture, NASA astronaut Michael Barratt, STS-133 mission specialist, shakes hands with Robonaut 2 during a news conference in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center in Houston. Ron Diftler, NASA Robonaut project manager, is at left. Astronaut Catherine Coleman said Friday, March 4, 2011 that she and the 11 other humans aboard the shuttle-station complex want to get R2 out of its packing material as soon as possible. (AP Photo/NASA, Lauren Harnett)

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