TONY & DAPHNE HALLAS / SCIENCE PHOTO LIBRARY TONY & DAPHNE HALLAS / SCIENCE PHOTO LIBRARY
Canis Major constellation. Optical image of the constellation Canis Major, the Great Dog. At upper centre is Sirius (Alpha Canis Majoris), the brightest star in the sky. It is a blue-white star which lies only 8.6 light years from Earth. Canis Major is a winter constellation for northern hemisphere observers.
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