FRANK ZULLO / SCIENCE PHOTO LIBRARY FRANK ZULLO / SCIENCE PHOTO LIBRARY
Canis Major constellation. Starfield with the Canis Major or Great Dog constellation visible above light pollution from a city. Canis major runs from centre left to the bright Sirius star (at upper right) and then diagonally down to the right. Sirius, the Dog Star, is the brightest star in the night sky. Canis major is a winter constellation in the northern hemisphere. Light pollution from cities is a major problem for astronomers as it drowns out dim stars. Photographed over Phoenix in Arizona, USA.
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