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Videos of astronaut's in the International Space Station (ISS) show them floating around apparently weightless. Why do they not seem to be feeling the Earth's gravity?


They are so far away from the Earth that the gravity is negligible.


They space station's engine's are pushing them forward, keeping the Earth's gravity from affecting them.


The space station is in free-fall, resulting in apparent weightlessness.


When things are launched into space by rockets, they lose all of their gravitational potential energy, and are thereafter weightless.

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