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SAS (abbreviation)
Space Adaptation Syndrome, or space sickness. Over half of all astronauts experience nausea leading to vomiting when they are first in zero-G, beginning with Gherman Titov on the second manned orbital flight. It normally passes after a day or two.

AKA: SAS.

All efforts by American and Russian researchers to determine its exact cause or to predict which individuals might experience it have been fruitless. All efforts by astronauts to prevent it through severe acrobatic flight maneuvers before the mission, or sleeping on inclined boards, or challenging their vestibular systems on rotating rigs, have also failed. It is under-reported because astronauts do not want to compromise their mission plan or their chances for future missions by letting management know that they have the problem. Alternatively, Solar Array System (Skylab Orbital Workshop component)

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