This image is about 2.5 lyr wide and is only a small section of the Orion Nebula.
Hot young, massive stars are dispersing this part of the Orion Nebula and making it bright rather than dark via reflection and induced emission. The dispersal tends to turn off star formation. Star formation is complicated by these complex feedback mechanisms. In particular, note the Trapezium, a 4-star asterism near the center.
The obvious ones are near the Trapezium and have tails. Radiation pressure (i.e., EMR pressure) from the Trapezium and other Trapezium cluster is blowing away some of the gas and dust that forms the protoplanetary disks.
Download site: NASA: image #PR95-45A.
Image link: Itself.
Local file: local link: nasa_orion_nebula_001.html.
File: Star Formation file: nasa_orion_nebula_001.html.