to its distinct dust lanes (separately known as Barnard 85), M 20
it is commonly known as the Trifid Nebula. That is, it is "divided
into three lobes." This object is unique in that it consists
of a combination of open star cluster, emission nebula, and reflection
Lying near the heart of the Milky Way in the constellation of Sagittarius,
its estmated distance is somewhere between 2200 and 7600 light years.
It was catalogued by Charles Messier in 1764.