The Science of Weightlessness
You might think that astronauts experience weightlessness in space because they are far from the Earth’s gravity. According to Science, gravity in orbit is still around 90% as strong as on Earth’s surface. The reason why astronauts in the International Space Station feel weightless is because they are constantly falling together with the ISS. This infographic explain more on the science of weightlessness and changes in the human body after staying in a weightless conditions for a prolonged period of time. See also How Do Astronauts Control Temperature in Space and Travelling the Speed of Light.
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