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Unlike the other planets, Neptune's discovery was a triumph of mathematical prediction rather than direct observation. In 1846, French mathematician Urbain-Jean-Joseph Le Verrier calculated the existence and position of the planet after noticing irregularities in Uranus's orbit that couldn't be explained by known gravitational forces. His work prompted Johann Galle to point a telescope to the exact location, resulting in the first sighting of Neptune in just one hour. A mere days later, its largest moon, Triton, was also identified.
This indirect yet successful prediction underscores Neptune's elusive nature and hints at the complex gravitational interplay at the edge of our solar system.