A short rant about the Kate Upton "vomit comet" photo shoot...

[muriel_volestrangler]

139. You say it's 'negligible'; I, and the scientists, say it's clearly measurable

and the difference is partly due to the motion of the frame of reference in which you measure it.

American Heritage Science Dictionary: zero gravity

The condition of real or apparent weightlessness occurring when any gravitational forces acting on a body meet with no resistance so the body is allowed to accelerate freely. Bodies in free fall (including trajectories like orbits) experience zero gravity; bodies at rest on the Earth's surface do not, since they are subject to the counterforce of the surface supporting them.

Astronomy Encyclopedia, Philip's: zero gravity

Apparent absence of GRAVITATIONAL FORCES within a free-falling system. A body in a ‘zero gravity' or free-fall state experiences no sensation of weight, hence the ‘weightlessness’ of astronauts, since the spacecraft is continuously free falling towards the Earth while its transverse motion ensures that it gets no closer. The term ‘zero gravity’ does not imply a total absence of gravity, rather it refers to an absence of any detectable gravitational forces. Although gravity becomes very weak at large distances from massive bodies, it nowhere declines absolutely to zero. See also ACCELERATION OF FREE FALL

Illustrated Dictionary of Aviation, McGraw-Hill: zero g

The term stands for zero gravity. The aircraft flies in a straight and level flight at 1 g; zero g is normally not experienced. It gives a feeling of weightlessness. Besides being experienced in space, in the aircraft zero g may be experienced momentarily when leveling out from the climb attitude, when the stick is pushed over, and while entering a negative-g regime.

" It is not a claim that the force of gravity does not exist." No-one has ever claimed that. Don't invent strawmen. What we are doing is explaining the use of the terms 'zero g', 'zero gravity', 'weightless' and 'weightlessness' to you. And explaining that the terms are all used to refer to the aircraft flights that are the subject of the OP. By the people who do the flights.