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, and is located at an estimated distance of between 4,000 to 6,000 light years from Earth. It is one of only two star-forming nebulae...