Sh2-124 vs Sh2-104
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Sh2-124
Sh2-124 is a large, faint emission-nebula complex in the constellation Cygnus. It is associated with the infrared source RAFGL 2789 and the luminous object V645 Cygni, whose nature has been discussed in connection with a young or evolved massive star. Infrared observations are important for studying the obscured material in the region, because dust absorbs much of the visible light. The object is...
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Sh2-104
Sh2-104 is a compact emission nebula and H II region located in the constellation Cygnus. It is recognized by its distinct bubble-like appearance, which is sculpted by stellar winds from its central, massive stars. Astronomers study Sh2-104 as a primary example of the collect-and-collapse model of triggered star formation. This model describes how an expanding bubble of gas compresses surrounding...
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