"In 1920, Arthur Eddington suggested hydrogen-helium fusion could be the primary source of stellar energy. ... laboratory fusion of hydrogen isotopes was accomp

"In 1920, Arthur Eddington suggested hydrogen-helium fusion could be the primary source of stellar energy. ... laboratory fusion of hydrogen isotopes was accomplished by Mark Oliphant in 1932. ... the theory of the main cycle of nuclear fusion in stars was worked out by Hans Bethe." https://en.wikipedia.org/wiki/Nuclear_fusion https://en.wikipedia.org/wiki/Nuclear_fusion