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Lagoon Nebula. The Lagoon Nebula (catalogued as Messier 8 or M8, NGC 6523, Sharpless 25, RCW 146, and Gum 72) is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region.

The Lagoon Nebula (catalogued as Messier 8 or NGC Sharpless RCW and Gum is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region.