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Mercury astronauts in simulated weightless flight in C-131 aircraft flying zero-g trajectory

Mercury astronauts in simulated weightless flight in C-131 aircraft flying zero-g trajectory (the "vomit comet") at Wright Air Development Center, 1959. Weightless flights were a new form of training for the Mercury astronauts. These flights were nicknamed the "vomit comet" because of the nausea that is often induced. (Source: NASA. Public domain.)

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