Galaxy Clusters, Blue Stars and Cosmic Explosions
Photo: NASA; ESA; B. Williams and J. Dalcanton, Univer
Deep in the neighboring Andromeda galaxy, scientists have found a community of rare blue stars. These are stars that have prematurely cast off their outer layers of material to expose blue-hot cores, according to NASA. New observations show these stars scattered throughout the galaxy's center.
The rectangle box on the left shows the region in the Andromeda galaxy probed by the Hubble telescope. Top right: A grouping of blue stars near the galaxy's central black hole. Bottom right: a closer look at a rich population of blue stars. Image by NASA; ESA; B. Williams and J. Dalcanton, University of Washington, Seattle.