Cepheid variable stars exhibit regular pulsations whose period directly correlates with their intrinsic brightness (absolute luminosity). The Leavitt law establishes this relationship between ...

A Cepheid variable (or, simply Cepheid) is a specific type of variable star that has a period of variability closely tied with its absolute luminosity. They are generally giant, bright yellow stars.

Over the years, as I've enjoyed sharing my love of astronomy with you, I’ve rattled off the distances to many stars and galaxies. Except for within our solar system, trying to express those distances ...

Cepheid variable stars: Key to measuring cosmic distances and discovering ... By comparing their known luminosity with their observed brightness from Earth, astronomers can calculate their distance.

New research offers the most precise measurements yet of pulsating Cepheid stars, which may hold clues about the immense size and scale of our universe. Cepheids are a type of variable star that ...

In 1925, Edwin Hubble's observation of Cepheid variables in the Andromeda galaxy revolutionized astronomy, proving the existence of galaxies beyond the Milky Way. This discovery, aided by telescopes ...

We used to think the Milky Way was the only galaxy, but with one simple law, Henrietta Swan Leavitt changed that forever – and she didn't even need a telescope. A century ago, the Universe seemed like ...