The author in this work endeavours to solve the greatest scientific problem that has puzzled scientists for the past two hundred years. The question has arisen over and over again, since the discovery of universal gravitation by Sir Isaac Newton, as to what is the physical cause of the attraction of gravitation.Contents: Philosophy of gravitationMatterAetherEnergyHeat, a mode of motionLight, a mode of motionAether and electricityAether and magnetismAether and Newton's laws of motionAether and Kepler's lawsAether and cometsAether and starry worldAether and the universe
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