The cluster contains hundreds of stars, of which only a handful are commonly visible to the unaided eye.
The Crescent Nebula is a beautiful emission nebula in the constellation Cygnus, about 5000 light-years away. Also known as NGC 6888, Caldwell 27, Sharpless 105.
Other popular names in astronomy for the Hercules Globular cluster are : Messier 13 (M13) and NGC 6205. M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.
The Lagoon Nebula (catalogued as Messier 8 or M8, and as NGC 6523) is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as a H II region.