On a dark, moonless night, far away from city lights, you can look up to see thousands of stars glittering against the blackness of space. How did we ever figure out how far away the stars are? Harvard “computer” Henrietta Swan Leavitt solved the riddle of distance in astronomy. Her discovery ushered in the expanding universe and the stunning realization that our Milky Way Galaxy is literally one of trillions in the cosmos! #WomensHistory
Our Island Universe: Henrietta Swan Leavitt
space.com
