Who proposed the binary star theory?

Answer 1

The binary star theory, which posits that stars can exist in pairs orbiting around a common center of mass, was notably advanced by the astronomer William Herschel in the late 18th century. While he did not originate the concept of binary stars, his observational work contributed significantly to its acceptance and understanding. Subsequent developments in the theory were influenced by various astronomers, including John Herschel and later studies in stellar dynamics.