NATIONAL OPTICAL ASTRONOMY OBSERVATORIES / SCIENCE PHOTO LIBRARY NATIONAL OPTICAL ASTRONOMY OBSERVATORIES / SCIENCE PHOTO LIBRARY
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Triangulum Galaxy (M33, NGC 598), optical image. Also known as the Pinwheel Galaxy, this type Sc spiral galaxy is about 2 million light years away in the constellation Triangulum. It is over 30,000 light years across. It is part of the Local Group of galaxies that includes our Milky Way Galaxy. The galaxy contains star-forming regions that contain ionized hydrogen gas (red). Image taken by the 0.9-metre KPNO telescope, Kitt Peak, Arizona, USA. For this image combined with radio telescope observations, see image R852/029.
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