Algol (Beta Persei)

Algol, also known as Beta Persei, is a notable star in the constellation Perseus, famous for being a variable star. Located about 93 light-years away from Earth, it exhibits fluctuations in brightness due to its nature as a binary star system, where two stars orbit each other. This periodic dimming and brightening led to its nickname, the "Demon Star." Algol has been important in astronomy since ancient times and serves as a reference point for measuring stellar brightness. Its properties have helped scientists understand stellar evolution and the dynamics of binary systems.