M8 and M20
The M8(Lagoon) and M20(Trifid) nebulae are a pair of bright emission nebulae in the constellation Sagittarius.
M8 distance is estimated at 5000 light years which would make its physical diameter about 100 light years.
M20 consists of a conspicuous emission nebula as well as a remarkable reflection nebula.
Total exposure time 8 hours:
RGB 3.7,Ha 4.5