Weightlessness
Weightlessness is the condition experienced by an object or a person when they are in a state of freefall, where they do not feel any sensation of weight due to the absence of any external forces acting on them. In space and astronautical engineering context, weightlessness is a crucial factor that affects the design and operation of spacecraft and space stations. In microgravity environments, the behavior of fluids, materials, and living organisms is significantly different from that on Earth, which requires special considerations in the design of space systems. Astronauts also experience physiological changes in weightlessness, such as bone and muscle loss, cardiovascular changes, and fluid shifts, which need to be mitigated through exercise and other countermeasures.
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