A Massive Star in NGC 6357
Astronomers haven't figured out why NGC 6357 is forming some of the most massive stars ever discovered. In the greater nebula, the intricate patterns are caused by complex interactions between interstellar winds, radiation pressures, magnetic fields, and gravity. The overall glow of the Nebula results from the emission of light from ionized hydrogen gas. The central part of NGC 6357 spans about 10 light years and lies about 8,000 light years away towards the constellation of Scorpion.
Link to picture: http://apod.nasa.gov/apod/image/1011/ngc6357_hst_big.jpg
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