Foto de stock - NASA astronaut Chris Ferguson (left), STS-135 commander; along with astronauts Rex Walheim and Sandy Magnus, both mission specialists, participate in an ingressegress timeline training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

Imagen: NASA astronaut Chris Ferguson (left), STS-135 commander; along with astronauts Rex Walheim and Sandy Magnus, both mission specialists.

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