Henrietta Swan Leavitt, born OTD in 1868, discovered a relationship between the brightness and pulsing cycles of stars called Cepheid variables. Her finding was crucial to uncovering the accelerated expansion of the universe, and became known as Leavitt's Law. She discovered over 2,400 variable stars in her lifetime! 🌠 . . . . . . . . #womeninscience #star #stars #discover #inspire #women #womancrush #science #scientist #universe #expandinguniverse #cosmos #space #nightsky #learn #education #inspiration