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Let’s get into the nitty-gritty. Here’s how spaceflight changes the human body, one system at a time: 1. Your Muscles Shrink—Fast Ever had a lazy weekend where you barely moved? Now imagine doing that for a year , but with zero gravity pulling on your body. Without regular resistance, muscles shrink fast —especially those responsible for posture, like in your back, neck, and legs. In just two weeks , astronauts can lose 20% of their muscle mass . In six months, that number jumps to 30% . To fight this, astronauts exercise for 2.5 hours every day using special equipment designed for zero gravity. But even that isn’t always enough to prevent muscle loss. 2. Bones Get Weaker (and More Fragile) Your bones need stress—like walking, running, and lifting—to stay strong. In space, there’s none of that. As a result: Astronauts lose 1-2% of bone mass per month . After six months, they can lose up to 10% —the same amount elderly people lose in 10 years on Earth. It takes...
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