Space adaptation syndrome
（重定向自Spacesickness）
![NASA astronauts acclimating themselves to space adaptation syndrome in a KC-135 airplane that flies parabolic arcs to create short periods of weightlessness[1]](/Images/godic/202502/12/Space_adaptation_syndrome_acclimation3431.jpg")
Space adaptation syndrome (SAS) or space sickness is a condition experienced by around half of space travelers during adaptation to weightlessness. It is related to motion sickness, as the vestibular system adapts to weightlessness.