Gravitational force

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All bodies cause attraction to each other because of their masses. This attraction also exists if there is no atmosphere - Earth and Moon for example attract each other although vacuum of thousands of kilometers lies between them.

The gravitational attraction between bodies, which is dependent on their masses is called gravitation or gravitational force. This gravitational force is one of the four fundamental forces of physics. It causes objects to fall towards the Earth and planets and stars moving in predictable orbital paths.