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

CEPHEID (variable stars—the name given to stars which behave like δ Cephei—have played a distinguished part in modern astronomy. Their most characteristic feature—that there is a definite relation ...

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 calibrate the cosmic distance ladder and exhibit large-amplitude pulsations that provide interesting hydrodynamical insights into stellar atmospheres. Here, we investigate ...

In 1925, astronomer Edwin Hubble identified a Cepheid ... variable stars are crucial for determining distances to far-off galaxies. Their pulsation periods are directly related to their intrinsic ...

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 observing ...

If you picture the Milky Way as a whole, you probably think of it as a flat structure with a small bulging region in the middle and beautiful spiral arms stretching out. The reality is a fair bit more ...