Explanation:
For reasons unknown, NGC 6357 is forming some of the most massive stars ever
discovered. One such massive star, near the center of NGC 6357, is framed above
carving out its own interstellar castle with its energetic light from
surrounding gas and dust. 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. Near the more obvious Cat's Paw
nebula, NGC 6357 houses the open star cluster Pismis 24, home to many of these
tremendously bright and blue stars. 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.
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