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  <category>Classical mechanics</category>
  <symbol>G</symbol>
  <wiki>Newton's law of universal gravitation</wiki>
  <info>States that a point mass attracts every other point mass
by a force along a line between them. This force is
proportional to the product of the two masses with the
inverse square of the distance between them.

This was first formulated in Newton's Principia Mathematica,
published in 1687</info>
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