Cepheid variables are an important rung on the cosmic distance ladder, a system astronomers use that builds one observation ...

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.