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Another Robert Gendler masterpiece, this image will be published in the 2008 Guinness Book of World Records as the largest image in pixels (almost 400MP) of a Galaxy ever taken. It consists of multiple exposures totalling 90 hours to complete. Please visit Robert's site where you can see more of his work and order prints and books.
Credit: Robert Gendler.
Andromeda is an "island universe", an immense galaxy in its own right, similar to our Milky Way. M31 has the distinction of being the nearest galaxy to our own at a distance of 2.5 million light years. Its disk, tilted toward earth by some 13 degrees, exposes the grandeur of its spiral structure and star systems. Contrary to most galaxies which are receding away from each other, M31 and the Milky Way are actually moving toward each other and a close encounter or even a full collision may be in store for both galaxies in several billion years.
Recent Hubble observations have identified a rotating disk of more than 400 blue stars orbiting the nucleus of Andromeda. The disk of blue stars formed some 200 million years ago in a sudden starburst. The disk is only one light year in diameter and its stars have a remarkable orbital velocity of 2.2 million miles per hour, this remarkable speed can only be explained by a central black hole having a total mass of some 140 million suns. It is now widely believed that most, if not all, galaxies have supermassive black holes in their centers.