Zero-G Aircraft and Duration of Weightlessness

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A zero-gravity aircraft flies in a parabolic motion following a free-fall motion to provide a brief weightless environment.

Flat-Earthers claim videos of astronauts in space were faked in zero-gravity aircraft. In reality, a zero-gravity plane can only provide ~25 seconds of continuous weightlessness and cannot be used to film long-take videos in a weightless condition.