ROBERT GENDLER / SCIENCE PHOTO LIBRARY ROBERT GENDLER / SCIENCE PHOTO LIBRARY
Andromeda Galaxy. Composite image of the Andromeda Galaxy (M31; NGC 224). This galaxy is 2.2 million light years from Earth in the constellation Andromeda. At 200 light years across it is the largest galaxy in the 'local group', a cluster of about 25 galaxies that includes our own, the Milky Way. Like the Milky Way, Andromeda is a spiral galaxy with a dense central bulge packed with millions of stars. Here, two small companion galaxies are also seen: the irregular galaxy M110 (lower right) and the elliptical galaxy M32 (star-like object just left of Andromeda's centre). Image data from 8.2 Meter Subaru Telescope (NAOJ), Digitized Sky Survey, and the Hubble Space Telescope.
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