Roger Brady Tamal, California Cepheid variables are a type of star that undergo regular pulsations. The length of a Cepheid's pulsations is always related to its intrinsic, or absolute ...

At the center of these side-by-side images is a special class of star used as a milepost marker for measuring the universe’s rate of expansion – a Cepheid variable star. The two images are ...

Leavitt discovered 2,400 variable stars, about half of the known total in her day. Through these discoveries came her most important contribution to the field: the study of cepheid variable stars ...

Around 1924, Hubble was looking at the Andromeda nebula and found to his amazement that one of the stars he'd observed wasn't just any star, but a cepheid variable. In 1912 Henrietta Leavitt had ...