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Examples of HII Regions. Note the characteristic red color from excited hydrogen Note the OB associations when visible Note the columns of dust that are aligned toward the OB association. California Nebula and the Pleiades. Cat’s Paw Nebula. The Cone Nebula. Emission Nebula in NGC 3603.
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Examples of HII Regions • Note the characteristic red color from excited hydrogen • Note the OB associations when visible • Note the columns of dust that are aligned toward the OB association