MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Alien night sky showing a spiral galaxy seen face- on from a watery world. This galaxy has a large diffuse nucleus (centre) surrounded by its spiral arms. A galaxy is a large family of stars, bound together by gravitational attraction. It can contain many millions or billions of stars. Our own Milky Way galaxy is a spiral galaxy.
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