There must be a gravitational force acting on the moon and the planets for them to maintain their orbits around the Earth and the Sun, respectively.
What must be present for the moon to orbit the Earth and for planets to orbit the Sun?
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There must be a gravitational force acting on the moon and the planets for them to maintain their orbits around the Earth and the Sun, respectively.
For the moon to orbit the Earth and for planets to orbit the Sun, a gravitational force must be present, providing the necessary centripetal force to maintain their elliptical orbits and prevent them from moving in a straight line.