DR JEAN LORRE / SCIENCE PHOTO LIBRARY DR JEAN LORRE / SCIENCE PHOTO LIBRARY
Computer-processed optical photograph of the M81 spiral galaxy, showing populations of hot young stars (blue). Located 10.5 million light years from Earth, M81 is similar to our own Milky Way galaxy. It has a diameter of 100,000 light years and a mass of over 200,000 million Suns.
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