The attractive force of the earth acts to the greatest distance, and is observed in the fall of the moon, which is continually drawn towards the earth.
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"I consider my experiments as a kind of play."
"The causes of gravity are not yet discovered. It is by experiments and observations that we are to know them."
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From 'Principia Mathematica', Book III, Proposition IV, Theorem IV
Date: 1687
Nature & WorldFound in 1 providers: grok
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Earth's gravitational pull extends far into space, not just near the surface. The Moon doesn't fly off in a straight line because Earth continuously pulls it inward. This force — the same one that drops an apple — reaches across the vast distance to the Moon, bending its path into an orbit. Gravity is universal, operating across immense distances without physical contact.
Newton derived this directly from his law of universal gravitation, his most celebrated achievement. By calculating that the Moon's orbital acceleration matched the inverse-square law applied to Earth's surface gravity, he unified terrestrial and celestial mechanics. This was the empirical proof that his abstract mathematics described real physical reality, cementing his Principia Mathematica as the foundation of classical physics.
In Newton's era, the heavens were still widely considered separate from earthly physics — governed by different divine laws. Aristotelian and Cartesian cosmologies dominated. Newton's demonstration that a single force governed both falling bodies and planetary orbits shattered this division, launching the Scientific Revolution's crowning achievement and enabling precise astronomical prediction for the first time in history.
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