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: The longer its ...
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How did Edwin Hubble prove Andromeda was a galaxy?
How did a Cepheid variable star help Edwin Hubble prove the Andromeda Nebula was a galaxy? Roger Brady San Quentin, California Cepheids are rare variable stars with periods ranging from about 1 to 120 ...
An image of the Cepheid variable star RS Puppis. The most accurate observation to date of distant stars that periodically change in brightness may spark a rethink of the rate at which the universe ...
ABOVE: This composite photo by NASA, ESA, the Hubble Heritage Team and R. Gendler shows the Andromeda Galaxy. The Cepheid variable star V1 is indicated with an arrow, and four inset images show the ...
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 are very ...
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 ...
The new results, from a team led by Grzegorz Pietrzyski (Universidad de Concepcion, Chile, Obserwatorium Astronomiczne Uniwersytetu Warszawskiego, Poland), appear in the 25 November 2010 edition of ...
Cepheid stars have predictable brightness changes linked to their periods. This period-brightness relationship lets astronomers calculate a Cepheid's distance. Hubble found a Cepheid in the Andromeda ...
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