Space travel is often wrapped in romance — heroic missions, breathtaking views, and technological triumphs. Yet once the roar of rocket engines fades and a spacecraft settles into orbit, a very different and far less visible drama begins. It is the human body’s struggle to survive in an environment it was never designed for. For millions of years, human evolution unfolded under the constant pull of Earth’s gravity. Our bones, muscles, blood vessels, and balance system are all finely tuned to a force that relentlessly pulls us downward. Remove that force, and the body is forced into a rapid and radical adaptation process.…
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