Lagoon Nebula is a rather large nebula (especially for my set up) about 5,000 light-years distant, in the direction of the center of our Milky Way Galaxy. Hot stars in the open star cluster (bright blue stars in the center) power the nebular glow by process of ionization, complete with dust clouds that are not ionized (the black/gray structures). The structure that you see in the image is about 25 light years wide, and about 50% of the overall nebula.
This image is different than others as I have used Hydrogen Alpha filter to get the luminance data (as the Moon was bright while these images were taken). I have used a total of 17 images of H-alpha @20 minutes and then added 5 images each of Red, Blue & Green (of 10 minutes each) to give it appropriate color. (total imaging time – almost 9 hours).