
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.

Astronauts Chris Cassidy and Luca Parmitano work with the cargo in the newly attached Japanese "Kounotori" H2 Transfer Vehicle-4.

Astronaut Luca Parmitano prepares to open the hatch to the newly attached Japanese "Kounotori" H2 Transfer Vehicle-4.

Astronaut Luca Parmitano samples the air in the newly attached Japanese "Kounotori" H2 Transfer Vehicle-4.