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 ...

A cluster of young, pulsating stars discovered at the far side of the Milky Way may mark the location of a previously unseen dark-matter dominated dwarf galaxy hidden behind clouds of dust. The stars ...

THE oscillations induced in the principal modes of vibration of a star by a free oscillation in one of them, generally of the second order in the corresponding free amplitude, are unimportant unless ...

THE SPECTRA OF CEPHEID VARIABLES.—The detailed results of an extensive series of spectroscopic observa tions of twcntv Cepheid variables have been published bv Dr. Shapley (Astrophysical Journal, xliv ...

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

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 ...

Henrietta Leavitt joined the Harvard College Observatory as a volunteer in 1895. She was appointed to the permanent staff in 1902, and eventually became chief of the photometry department. She worked ...

Physicists have improved the accuracy of a technique that uses variable stars to measure distances in the universe, providing a new figure for its expansion rate. When you purchase through links on ...

A new survey of the stars in our galaxy reveals something unexpected: The Milky Way isn’t flat. Our galaxy is usually depicted as a flat disc of stars, but according to new research from the Chinese ...

There lies an abundance of older stars and less younger stars at the center of the Milky Way, but a new study has found that there are even less juvenile stars than previously thought. A team of ...