The Angel Nebula is a strikingly colourful nebula that includes NGC 2170 and NGC 2182. It is located some 2,500 light-years away towards the constellation Monoceros and is part of the Orion Molecular Cloud Complex, a region of active star formation in our Milky Way galaxy. The Angel Nebula owes its name to the ethereal and delicate appearance of its dust and gas clouds, which resemble the outstretched wings of an angel.
The interplay of light, dust, and gas makes the nebula one of the most colourful areas in the entire sky. The celestial scene features subtle variations in colour and intensity throughout its expanse, adding complexity and depth to the nebula's overall appearance. These variations are primarily due to differences in the density and composition of the interstellar material within the nebula, as well as variations in the temperature and luminosity of the embedded stars.
Within the nebula, several young, massive stars are concealed by the surrounding dust and gas clouds. These stars are part of the ongoing process of star formation and their intense radiation and powerful stellar winds contribute to the nebula's intricate structure and colourful glow.
Illuminated by the brilliant, hot stars within and around it, the nebula glows, scatters and reflects their light to produce a stunning display of colours. Vivid blue regions are indicative of the presence of dust particles that scatter blue light while allowing longer wavelengths to pass through. The patches of red and pink are primarily caused by the glow of Hydrogen emission (H-alpha) and warmer orange hues result from reddening of starlight by smaller dust grains and molecules in the nebula.

Resolution ............... 0.765 arcsec/px
Rotation ................. -1.332 deg
Focal distance ........... 1456.21 mm
Pixel size ............... 5.40 um
Field of view ............ 42' 24.0" x 31' 55.3"
Image center ............. RA: 6 08 31.590 Dec: -6 22 16.78

Image details:
Date: February - April 2023
Exposure: LHaRGB: 680:930:120:110:145 mins, total 33 hours 5 mins @ -25C
Telescope: Homebuilt 12.5" f/4 Serrurier Truss Newtonian
Camera: QSI 683wsg with Lodestar guider
Filters: Astrodon LRGB E-Series Gen 2, Astrodon 3nm Ha
Taken from my observatory in Auckland, New Zealand