Foto de stock - NASA astronauts Chris Ferguson (right), STS-135 commander; and Doug Hurley (left), pilot; along with Rex Walheim and Sandy Magnus (right background), both mission specialists, participate in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Crew instructors assisted the crew members. STS-135 is planned to be the final mission of the space shuttle program.

Imagen: NASA astronauts Chris Ferguson (right), STS-135 commander; and Doug Hurley (left), pilot; along with Rex Walheim and Sandy Magnus (right background).

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