Answer:
Every
object in the universe attracts every other object with a force which is directly
proportional to the product of their masses and inversely proportional to the
square of the distance between them. This force is directed along the line
joining the centres of two objects. That is, 
and 
are masses of objects
and r is the separation between them, then force of gravitation
where G is a
constant called universal gravitational constant.
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