Every object in the universe that has mass experts a gravitational pull,or force ,on other masses .
The size of the pull depends on the masses of the objects .
In fact,
To leave earths gravitational pull behind,an object must travel 17 miles per sec our planets escape velocity .
Unlike force ,with its dark & light sides,gravity has no duality ,it only attracts never repels. gravity is also the reason why earths spins around the sun
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