Asaph Hall
American astronomer (1829-1907) · United States · Scientists · Died at 78
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Something wrong?He found Mars's two moons in 1877 when most astronomers thought there were none to find.
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Asaph Hall III was born October 15, 1829, and spent decades mapping the mechanics of the solar system - calculating satellite orbits, measuring Saturn's rotation, weighing Mars itself. In August 1877, working at the U.S. Naval Observatory, he turned a telescope on Mars and spotted what no one else had: two tiny moons wheeling close to the planet, which he named Deimos and Phobos. The discovery made him one of the era's most prominent astronomers, a specialist in double stars and planetary systems. He died November 22, 1907, having proven that even well-watched worlds can hide something in plain sight.
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