Weightlessness
Videos
Weightlessness is the complete or near-complete absence of the sensation of weight, i.e., zero apparent weight. It is also termed zero g-force, or zero-g or, misleadingly, zero gravity.
Astronauts on the International Space Station experience only microgravity and thus display an example of weightlessness. Michael Foale can be seen exercising in the foreground.
NASA's KC-135A plane ascending for a zero gravity maneuver
Inside a Russian Ilyushin 76MDK of the Gagarin Cosmonaut Training Center
Zero-gravity testing at the NASA Zero Gravity Research Facility
Drop tube
Videos
In physics and materials science, a drop tube or drop tower is a structure used to produce a controlled period of weightlessness for an object under study. Air bags, polystyrene pellets, and magnetic
A view down the tube of NASA Glenn's 5 second Zero Gravity Facility.
A view down the shaft of NASA Glenn's 2.2 second drop tower. A large (deflated) air bag is at the bottom.