ROBERT GENDLER / SCIENCE PHOTO LIBRARY ROBERT GENDLER / SCIENCE PHOTO LIBRARY
Pinwheel galaxy (M33), optical image. This spiral galaxy is part of the Local Group of galaxies that also includes our Milky Way and the Andromeda galaxy. It is much smaller than our galaxy and Andromeda, though. Its spiral arms contain a large number of starbirth regions (pink). These are giant nebulae, which glow pink as radiation from the newborn stars ionises hydrogen in them. This galaxy lies just three million light years away in the constellation Triangulum.
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