How did a Cepheid variable star help Edwin Hubble prove the Andromeda Nebula was a galaxy? Roger BradySan Quentin, California ...

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.

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, brightness in a simple way: ...

Polaris is the closest, brightest cepheid variable. Very recently, something changed. When you look up in the night sky and find your way to the North Star, you are looking at Polaris.

Researchers have discovered that Cepheid variable stars in our neighboring galaxy, the Small Magellanic Cloud, are moving in opposing directions along two distinct axes. They found that stars ...

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 ...

Arrows show the velocities of approximately 4,000 Cepheid variable stars. Green arrows represent closer stars, while magenta arrows indicate more distant stars. The green star (★) marks the ...

Cepheid Variable Star P42 in NGC 5468 (IMAGE) NASA/Goddard Space Flight Center. Caption. At the center of these side-by-side images is a special class of star used as a milepost marker for ...

Comparison of simulation of three main star forming episodes in the spiral arms with the currently observed Cepheid variables. Oldest stars (red) are 400 million years old and the youngest (blue) are ...

It was in 1912 that Harvard College astronomer Henrietta Swan Leavitt noticed that the longer it takes one of these “Cepheid” variable stars to complete one cycle, the more luminous the star ...

The method of measuring distance to stars beyond 400 light-years is to use Cepheid variable stars. Cepheid variables change in brightness over time, with a regular period.

Cepheid variables are a type of star that pulsates radially, varying in diameter and temperature, which results in changes in their brightness over regular periods.