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Monday, October 28, 2013

Astronomy Picture of the Day

A Massive Star in NGC 6357 

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 below 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 windsradiation pressuresmagnetic 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.

See Explanation.  Clicking on the picture will download
 the highest resolution version available.
Image Credit: NASAESA and J. Maiz Apell├íniz (IAA, Spain)