Astronauts experience weightlessness in space from "summary" of A Man on the Moon by Andrew Chaikin
In space, where there is no gravity to pull them down, astronauts experience a sensation that is unlike anything they have ever felt before. They become weightless, floating freely inside their spacecraft, with nothing to anchor them to the floor. This feeling of weightlessness is a result of the spacecraft and everything inside it, including the astronauts themselves, being in a state of constant free fall as they orbit the Earth. As the spacecraft hurtles through space at incredibly high speeds, the force of gravity is still present, but it is counteracted by the centrifugal force created by the spacecraft's motion. This delicate balance between gravity and centrifugal force allows the astronauts to experience weightlessness and move about the spacecraft with ease. Without the constraints of gravity, they can float effortlessly from one side of the spacecraft to the other, performing tasks and conducting experiments in a way that would be impossible on Ea...
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