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Andrew R. Morgan, one of the eight-member 2013 class of NASA astronaut candidates, speaks to a special media-day crowd on…

Christina M. Hammock, one of the eight-member 2013 class of NASA astronaut candidates, speaks to a special media-day crowd at…

Janet Kavandi, director of Flight Crew Operations at NASA's Johnson Space Center, speaks at a special media-day program.

On Aug. 20, 2013, NASA Administrator Charlie Bolden speaks at a special media-day event at the Johnson Space Center.

Nicole Aunapu Mann, one of the eight-member 2013 class of NASA astronaut candidates, speaks to a special media-day crowd on…

Jessica U. Meir, one of the eight-member 2013 class of NASA astronaut candidates, speaks to a special media-day crowd on…

Victor J. Glover, one of the eight-member 2013 class of NASA astronaut candidates, speaks to a special media-day crowd at…

Astronaut Chris Cassidy conducts a session with a pair of bowling-ball-sized free-flying satellites known as SPHERES.

Astronaut Chris Cassidy conducts a session with a pair of bowling-ball-sized free-flying satellites known as SPHERES.

Astronaut Karen Nyberg conducts a session with a pair of bowling-ball-sized free-flying satellites known as SPHERES.