Paul Scully-Power, 41-G payload specialist, links arms with two others as they experience weightlessness in the KC-135 training aircraft. The trio appears to be flying toward the front of the aircraft while others take photos.

ASTRONAUT TRAINING ASTRONAUTS CREWS KC-135 PARABOLIC FLIGHT SPACE FLIGHT TRAINING WEIGHTLESSNESS ZERO GRAVITY

View of Zero-G training for astronauts and payload specialists