Newton Doubted Gravity – How an Invisible Planet Proved Him Right
In the late 17th century, Isaac Newton himself found universal gravitation troubling, calling it "an absurdity" that one body could act on another across a vacuum. Yet the mathematics of his gravitational law later allowed astronomers to predict the existence of Neptune — the "invisible planet" — purely from anomalies in Uranus's orbit. Neptune's discovery in 1846 became one of science's greatest predictive triumphs.
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