MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Spiral galaxy with a yellow 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. The spiral arms are not rigid structures. They are thought to be density waves formed by the different speed of orbiting stars which actually move in and out of them.
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