RUSSELL CROMAN / SCIENCE PHOTO LIBRARY RUSSELL CROMAN / SCIENCE PHOTO LIBRARY
Spiral galaxy M74, optical image. The galaxy is seen face-on from Earth, allowing the structure of its spiral arms to be studied. The arms contain pink starbirth regions and have a high population of hot young stars, which give the arms their blue colour. The central nucleus appears yellower as it contains older, redder stars, and much of their light is obscured by dust. M74 lies around 30 million light years from Earth in the constellation Pisces.
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