Over a hundred light-years across, M8 is also known as the Lagoon Nebula.
Divided by obscuring dust lanes, M20's popular moniker is the Trifid.
In the composite image, narrow emission lines from sulfur, hydrogen, and oxygen atoms recorded through the filters, are mapped into broader red, green, and blue colors respectively.
The color scheme was made popular in Hubble Space Telescope images.
But for ground-based telescopes, narrow band filters also make it possible to reject overwhelming light-pollution and capture compelling images of the cosmos from urban skies.
