Astronomers from the University of Warsaw, Poland and elsewhere have detected a new classical Cepheid variable star. The newfound star, which received designation OGLE-GD-CEP-1884, has the longest ...

By studying a Cepheid variable star within the Andromeda Galaxy, Edwin Hubble proved that Andromeda was too far away to be a nebula within the Milky Way. Here, the insets show that same variable ...

A decade of observations by NASA’s Hubble Space Telescope has produced the sharpest and most detailed images of the Andromeda galaxy. Zoom in and explore.

The Cepheid variable star V1 is indicated with an arrow, and four inset images show the star’s variable brightness over several weeks. It helped determine that Andromeda was another galaxy ...

It contains a Cepheid variable star pulsating every 3.8 days. The other star is slightly bigger and cooler, and the two stars orbit each other in 310 days.

Using ESA's XMM-Newton spacecraft, astronomers have conducted X-ray observations of a peculiar Cepheid variable star known as V473 Lyr. Results of the study suggest that this star has a young, low ...

This marks the first time a Cepheid variable—a strange, pulsating type of star that includes Polaris—has been observed up close.

The researchers gathered 2,330 Cepheid variables catalogued by an infrared telescope called the Wide-field Infrared Survey Explorer, and whittled down the list to 1,339 stars based on their ...

Cepheid variable stars are believed to be large, hot stars five to 20 times as massive as the sun. They vary in light output by pulsating; the star contracts and expands.

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.

Caption 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 ...

It contains a Cepheid variable star pulsating every 3.8 days. The other star is slightly bigger and cooler, and the two stars orbit each other in 310 days.