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According to Newton's law of gravitation...

According to Newton's law of gravitation, if each body in the universe attracts every other body, why don't two bodies come towards each other? 

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`implies` Because gravitational force exerted by `F prop m_(1)m_(2)`. Two bodies are very small and `m_(1)m_2` will be small and so F is small and hence they do not attract each other.
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