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Thomas Malthus - The moon is not kept in her orbit...
The moon is not kept in her orbit round the earth, nor the earth in her orbit round the sun, by a force that varies merely in the inverse ratio of the squares of the distances. (Thomas Malthus)

The moon is not kept in her orbit round the earth, nor the earth in her orbit round the sun, by a force that varies merely in the inverse ratio of the squares of the distances.

Thomas Malthus

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earth force inverse moon nor orbit ratio round sun

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