Sh2-126 vs Sh2-276
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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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Sh2-276
Sh2-276, also known as Barnard’s Loop, is a vast emission nebula situated within the Orion constellation. Observed by E.E. Barnard in 1894, it represents a prominent arc of glowing gas linked to the larger Orion-Eridanus superbubble. The nebula's structure—particularly the Barnards loop—is notable for its size and connection to star formation activity. Astronomers and those studying stellar bubble...
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