State the source of the centripetal force that a planet requires to revolve around the sun. On what factors does that force depend? Suppose this force suddenly becomes zero then in which direction will the planet begin to move if no other celestial body affects it?
The figure is given below:

The source of centripetal force depends upon the force of attraction between planets and the Sun.
It depends on the mass of the planets and the sun and also, on the distance between them.
Suppose this centripetal force becomes zero the planet would move tangentially outward to the circular path it used to describe.
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