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Artificial gravity can be created in a spacecraft by rotating the structure. Occupants feel a centrifugal force pushing them towards the outer hull, mimicking gravity. The magnitude of this apparent gravity is given by [latex]a = \omega^2 r[/latex], where [latex]\omega[/latex] is the angular velocity and [latex]r[/latex] is the radius of rotation. This is proposed to counteract the negative health effects of long-term weightlessness.
The creation of artificial gravity is considered essential for long-term human spaceflight to mitigate the adverse health effects of weightlessness, such as muscle atrophy and bone density loss. The most practical proposed method is to use centrifugal force. By spinning a spacecraft or a section of it, an inertial force is generated that pushes everything inside towards the outer wall. From the perspective of an astronaut in this rotating frame, this outward push is indistinguishable from gravity. The strength of this “gravity” depends on the radius of the rotating structure and its rate of spin. A larger radius allows for a slower rotation rate to achieve Earth-like gravity ([latex]1g[/latex]), which is desirable to minimize disorienting effects like the Coriolis effect. For example, a structure with a radius of 224 meters would need to rotate at 2 revolutions per minute (RPM) to simulate 1g. Smaller radii require much faster rotation, which can cause motion sickness and other physiological problems. This trade-off between size, structural mass, and physiological comfort is a major challenge in designing rotating spacecraft.
The concept was first scientifically proposed by Konstantin Tsiolkovsky in 1903. Later, Wernher von Braun and other space pioneers incorporated rotating designs into their proposals for space stations and interplanetary vessels. While no crewed spacecraft has yet been built with a full artificial gravity system, numerous design studies, such as the Stanford Torus and the O’Neill Cylinder, have explored large-scale rotating habitats. On a smaller scale, centrifuges are used on the ground to train pilots and astronauts to withstand high-g forces and to conduct research on the effects of hypergravity on organisms.
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