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Astronauts can't stay in space longer than six months primarily due to the harmful effects of prolonged exposure to microgravity and cosmic radiation. Extended time in microgravity can lead to muscle atrophy, bone density loss, and fluid shifts that affect vision and overall health. Additionally, the risks associated with radiation exposure increase over time, potentially leading to higher chances of cancer and other health issues. Support systems for life, such as food, water, and psychological well-being, also become increasingly challenging to maintain beyond this duration.

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1mo ago

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