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 is the largest photomosaic ever assembled from Hubble Space Telescope observations. It is a panoramic view of the neighboring Andromeda galaxy, located 2.5 million light-years away.

Edwin Hubble ... taking images of spiral nebulae every clear night and looking for the telltale variations of Cepheid variables. By the end of 1924, he had found 12 Cepheids in M31.

The Andromeda nebula, M31, was a prominent ... stars in some of the nebulae. Edwin Hubble uses the telescope at the Mount Wilson Observatory. Photo by Ann Ronan Pictures/Print Collector/Getty ...

Edwin Hubble ... taking images of spiral nebulae every clear night and looking for the telltale variations of Cepheid variables. By the end of 1924, he had found 12 Cepheids in M31.

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size ... Hubble worked hard, taking images of spiral nebulae every clear night and looking for the telltale variations of Cepheid ...