M20 - The Trifid Nebula
[The Trifid Nebula] consists of both an emission nebula and a reflection nebula - making it look truly stunning. When William Herschel first observed this object it was given 4 distinct classifications, though the Messier catalogue has it down as one object - M20 (but its also called a cluster of stars!). The structure of this object is given by the red-glowing gas which comes from the interstellar hydrogen gas being ionized by the young stars whilst the dark regions are mostly likely created by the debris from supernovae.
