What is the physical term for the state of weightlessness experienced by astronauts orbiting the Earth?
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Astronauts in orbit are not actually free from Earth's gravity, which is still about ninety percent as strong up there. Instead, they are in a constant state of free fall around the planet, matching the curve of Earth's surface. Because they and their spacecraft fall together at the exact same rate, they float effortlessly inside, creating the illusion of zero gravity.
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Source: Wikipedia (CC BY-SA)
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