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This book focuses on all of the major problems associated with the absence of body weight in space, by analyzing effects, adaption, and re-adaptation upon returning to Earth, using sound scientific principles embedded in a historical context. Serious problems for space travelers range from Space Motion Sickness (SMS) to recently discovered ocular effects that may permanently impair vision. Fluid loss and shifts, spinal changes, and bone and muscle loss are also all results of weightlessness. Starting with a brief definition and history of weightlessness, the authors then address in detail each problem as well as the countermeasures aimed at alleviating them. In some cases, alternative hypotheses regarding what can and should be attempted are also presented. As plans for long-term missions to the Moon and Mars develop, it will be essential to find countermeasures to weightlessness that are effective for missions that could span years.

Physics. --- Human physiology. --- Rehabilitation. --- Aerospace engineering. --- Astronautics. --- Biological and Medical Physics, Biophysics. --- Human Physiology. --- Aerospace Technology and Astronautics. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Weightlessness. --- Free fall, Physiological effect of --- Gravity-free state, Physiological effect of --- Subgravity state, Physiological effect of --- Zero-gravity state, Physiological effect of --- Gravitation --- Gravity --- Space biology --- Physiological effect --- Astrophysics. --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Space sciences --- Aeronautics --- Astrodynamics --- Space flight --- Space vehicles --- Human biology --- Medical sciences --- Physiology --- Human body --- Biophysics. --- Biological physics. --- Space sciences. --- Science and space --- Space research --- Cosmology --- Science --- Aeronautical engineering --- Astronautics --- Engineering --- Biological physics --- Biology

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