Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it?
The moon revolves around the earth due to the gravitational force provided by the earth. If suddenly, the gravity of the earth becomes zero, then there is no centripetal force provided by the earth's gravity to move the moon in a circular path. Then suddenly it will start to move in a straight linear path in the direction of tangential to the circular path$(orbit)$ at that instant.
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