Earth is fortunate to be orbiting a star that is fairly constant in its light production. The amount of light energy reaching Earth from the Sun has varied by much less than 1 percent over the past ...

Astronomers have discovered more than 200 distant variable stars known as RR Lyrae stars in the Milky Way’s stellar halo. The most distant of these stars is more than a million light years from Earth, ...

Many, perhaps most, stars in the universe live their lives with companions by their sides — in so-called binary systems. Until recently, however, the ancient RR Lyrae stars appeared, for mysterious ...

A team led by Andrea Kunder from the Leibniz Institute for Astrophysics Potsdam (AIP) measured the velocity of a sample of 100 old RR Lyrae stars* thought to reside in the galactic bulge, the central ...

POTSDAM, Germany, April 22 (UPI) --The Milky Way hosts several generations of stars. Finding the really old ones -- the stars that witnessed the birth and early evolution of the galaxy -- isn't easy.

Publications of the Astronomical Society of the Pacific, Vol. 109, No. 741 (1997 November), pp. 1221-1232 (12 pages) Strömgren uvbyß photometry of SX Phoenicis and large-amplitude δ Scuti variables is ...