BARNEY MAGRATH / SCIENCE PHOTO LIBRARY BARNEY MAGRATH / SCIENCE PHOTO LIBRARY
Optical photograph of part of the Milky Way in the constellation of the Southern Cross, showing the dark Coalsack nebula at centre. The coalsack is a region of dark dust which absorbs the light of the stars beyond. The small, bright, fuzzy object at upper left is Omega Centauri (NGC 5139), a massive globular cluster some 620 light years across.
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