Cepheid stars are slowly dying, and their outer layers of helium gas grow and shrink as they absorb and release radiation, making them flicker like distant signal lamps. As Cepheids get brighter ...

At the Harvard College Observatory in years around 1900, women were hired to make measurements of astronomical data and do ...

He was bored with law and decided to go back to his studies in astronomy. In 1919 he began ... In 1924, he announced the discovery of a Cepheid, or variable star, in the Andromeda Nebulae.