Sh2-126 vs Sh2-119
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Sh2-126
Sh2-126 is a large, faint emission-nebula complex in the constellation Lacerta and is catalogued in Stewart Sharpless's second catalogue of H II regions. Its hydrogen gas is ionized chiefly by ultraviolet radiation from 10 Lacertae, an O-type star associated with the Lacerta OB1 stellar group. Because the nebula covers a broad area of sky and has low surface brightness, it is principally a target...
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Sh2-119
Sh2-119, also known as the Clamshell Nebula, is an H II region in the constellation Cygnus. It surrounds the O-type star 68 Cygni and forms a ring-shaped Strömgren sphere, created by the star's intense ultraviolet radiation ionizing the surrounding hydrogen gas. The nebula is listed in the Sharpless catalog of emission nebulae and is located approximately 5,000 light-years from Earth. It is often...
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