| 1. | The expanding shell of gas forms a supernova remnant, a special diffuse nebula.
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| 2. | "' NGC 261 "'is a diffuse nebula located in the constellation Tucana.
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| 3. | "' NGC 6357 "'is a diffuse nebula near NGC 6334 in the constellation Scorpius.
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| 4. | This star is surrounded by a diffuse nebula called IC1318, or the " Gamma Cygni region ".
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| 5. | The star is located in a diffuse nebula called " Hubble's Variable Nebula " ( NGC 2261 ).
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