Seagull nebula
Seagull nebula (IC2177) is a large emission nebula in Canis Major constellation at ~3700 ly. It spans more than 200 ly and contains gas, dust and newborn hot stars that emit intense radiation and make the nebula glow.
Total exposure for this image was 1 hour (20 × 3 min) - taken using WO UC108 with ASI2600MC-Duo and Optolong LeXtreme narrowband filter.