# How does mass affect orbital period?

Gravity causes an object to orbit another, such as a planet around a sun, and this is known as the centripetal force being brought about by gravity.

The orbital period decreases as the mass of the orbited body increases.

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The mass of an object does not affect its orbital period. Orbital period is determined solely by the mass of the central body being orbited and the distance between the two objects. This is described by Kepler's third law of planetary motion, which states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. Therefore, the mass of the orbiting object has no effect on its orbital period.

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