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For reasons unknown, NGC 6357 is forming some of the most massive stars ever discovered. The central part of NGC 6357 shown spans about 10 light years and lies about 8,000 light years away toward the constellation of the Scorpion. Credit: NASA

~~Cradled in cosmic dust and glowing hydrogen, stellar nurseries in Orion the Hunter lie at the edge of a giant molecular cloud some 1,500 light-years away | Rogelio Bernal Andreo~~