ROBERT GENDLER / SCIENCE PHOTO LIBRARY ROBERT GENDLER / SCIENCE PHOTO LIBRARY
Spiral galaxy M81, optical image. This galaxy lies around 12 million light years from Earth in the constellation Ursa Major. It has fine blue spiral arms studded with small pink starbirth regions. The central nucleus appears yellower as it has a higher proportion of older, redder stars. M81 is interacting with a smaller galaxy, M82 (not seen), which lies only 150,000 light years from it.
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