Answer: For near stars, astronomers use a method called parallax. During Earth’s orbit, near stars seem to shift their position against the farther stars. This is called parallax shift. By ...

Scientists using the James Webb and Hubble space telescopes have confirmed one of the biggest head-scratchers in modern ...

And deep in the Milky Way, lies a Cepheid star four times larger than the sun — but that’s not the shocker. Within that star, which is named V470 Cas, is a rich layer of lithium. Astronomers ...

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

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 ...

In commemoration of Edwin Hubble's discovery of a Cepheid variable class star, called V1, in the neighboring Andromeda galaxy 100 years ago, astronomers partnered with the American Association of ...

Photo: Andromeda nebula plate with Hubble's handwritten circle around the variable star he discovered In 1919 American astronomer Edwin Hubble began work at the Mount Wilson Observatory in ...