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 ...

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 ...

This rare type of pulsating star, called a Cepheid variable, is used as milepost markers for distant celestial objects. There are no tape-measures in space, but by the early 20th century Henrietta ...

Leavitt realized that with cepheid variable stars (which change brightness with great regularity), there is a direct correlation between a star's magnitude (degree of brightness) and the length of ...

(1) THE determination of the past duration of solar radiation, and, consequently, the problem of the age of the inhabitable earth, imposes upon theories of radiation a difficulty the magnitude and ...

the cepheid variable period-luminosity relationship. By intense observation of a certain class of variable star, the cepheids, Leavitt discovered a direct correlation between the time it took a ...

The Fourier transform is a mathematical analogy, but should not be taken as a suggestion that the star is actually pulsating in several modes. The use of mathematical analogies is discussed in ...