Arthur Eddington

Eddington led an expedition to the island of Príncipe off the west coast of Africa to photograph stars near the Sun during the total solar eclipse on May 29, 1919. The observed positions of these stars were shifted by an amount consistent with Einstein's prediction that gravity bends light, providing the first empirical evidence for general relativity.

Eddington was one of the few scientists outside Germany who understood general relativity during World War I, and he wrote early English-language reports introducing Einstein's work to the scientific community. His 1919 expedition results were announced at a joint meeting of the Royal Society and the Royal Astronomical Society, making Einstein an international celebrity overnight.

The Eddington limit, or Eddington luminosity, is the maximum brightness a star can achieve before the outward pressure of its own radiation overcomes the inward pull of gravity, causing material to be blown away. This concept remains fundamental to understanding the upper mass limits of stars and the behavior of accreting black holes.

Yes, Eddington was a pioneering astrophysicist who made fundamental contributions to understanding stellar structure, including the mass-luminosity relationship for stars. His 1926 book 'The Internal Constitution of the Stars' laid the groundwork for modern stellar astrophysics and was among the first to propose nuclear fusion as the source of stellar energy.