John Michell

English clergyman and polymath scientist who was the first in history to suggest the existence of 'dark stars' — objects whose gravity is so strong that they do not let light escape. This idea became the forerunner of the black hole concept.

Biography

Born in 1724 in Nottinghamshire, England. Studied at Cambridge University, where he received a bachelor's degree in 1748 and then became a clergyman. Was a professor of geology, but worked in a wide range of sciences: astronomy, physics, seismology. In 1783, in a letter to Henry Cavendish, he outlined the idea that light could be trapped by a star's gravity. He designed a torsion balance to measure gravity but did not have time to use it; the instrument was later used by Cavendish to weigh the Earth. He was not widely known during his lifetime.

Key discoveries

First scientific formulation of the black hole (dark star) concept in 1783: calculation
at what mass and radius a star would trap its light
pioneering works in geology and seismology (first understood
that earthquakes propagate as waves)
development of the torsion balance
which was later used by Cavendish.

💡 Michell was a contemporary of William Herschel, but unlike him, he received almost no recognition. His idea of dark stars was forgotten for a century until it was rediscovered by Laplace. Michell also was the first to suggest that binary stars are physically connected systems, not just a chance alignment in the sky.

Quote: "If a star had the same density as the Sun but a diameter 500 times larger, its light would not be able to reach us due to its own gravitational attraction."

Biography

Key discoveries

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