M42 The Orion Nebula & NGC 1977 The Running Man Nebula
15 x 180 Seconds at ISO 1600. Hutech Idas LP Filter.
M 42 is the finest example of a diffuse emission nebula visible to mid-northern hemisphere observers, and is the brightest diffuse nebula in the sky, shining at 4th magnitude. It is also a large object, extending over 1 degree in diameter, and covers more than four times the area of the full moon.
Messier 43 is a bright nebulous arc to the north, detached from the main body of M 42 by a dark lane.
The Orion Nebula contains a very young open cluster, known as the Trapezium cluster due to the asterism formed by its four primary stars. Two of these can be resolved into their component binary systems on nights with good seeing, giving a total of six stars.
NGC 1977 The Running Man Nebula is also associated with Orion's giant molecular cloud, which lies about 1,500 light-years away. But these objects are dominated by the characteristic blue color of interstellar dust reflecting light from hot young stars.