Delta Cephei, the archetype Cepheid variable star, is located in the constellation Cepheus, a circumpolar constellation visible in the northern sky. Delta Cephei's position can be determined relative ...

To measure distances in the Universe, astronomers use Cepheids, a family of variable stars whose luminosity varies with time. Their role as distance calibrators has brought them attention from ...

Five bright planets are spread unevenly across the night sky: two of them become visible — at opposite sides of the sky — shortly after sunset, another two around midnight, and the final one at dawn.

To measure distances in the Universe, astronomers use Cepheids, a family of variable stars whose luminosity varies with time. Their role as distance calibrators has brought them attention from ...

Publications of the Astronomical Society of the Pacific, the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, as part of the ASP’s mission ...

To measure distances in the Universe, astronomers use Cepheids, a family of variable stars whose luminosity varies with time. Their role as distance calibrators has brought them attention from ...