Astronauts Orbiting Earth in the Space Shuttle Experience So-Called Weightlessness

Astronauts orbiting Earth in the space shuttle experience so-called weightlessness in space because

A) they are farther away from Earth.
B) of centrifugal force.
C) the gravitational pull of the Moon counteracts Earth's gravitational pull.
D) they are in constant free fall around Earth.
E) they are in space where there is no gravity.

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