MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Spiral galaxy. Computer graphic of an imaginary spiral galaxy against a black background. The white stars in the galaxy's arms are streaked, creating an impression of rapid movement as the galaxy spins round. Its centre is yellow. A spiral galaxy consists of arms of stars and gas curving out from a rotating centre. The majority of galaxies are thought to be spiral, including our own, the Milky Way.
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