EMISSION NEBULAE

Emission nebulae are so named because their light is emitted from gas excited by energetic radiation from nearby hot stars. The gas is always rich in hydrogen, the most abundant element, and it glows with a distinctive red hue.The hydrogen is often mixed with oxygen, which provides green light. Green and red together give yellow, while dust, which both absorbs starlight and reflects it, provides blue reflection nebulae. All these effects are seen in the beautiful Orion nebula, alongside. The nebulae in Orion feature extensively in this collection because, at 1500 light years distant, they are among the closest of the Galaxy's star-forming regions.
UKS 26. Between the Trifid and Lagoon nebulae
AAT 12. The Trifid Nebula in Sagittarius, M20
UKS 29. The Cone nebula, S Mon, NGC 2261 and Trumpler 5
AAT 13. The Cone Nebula in the NGC 2264 cluster
AAT 14. NGC 2264 and S Monocerotis.
AAT 47. The dust lanes in Messier 16
UKS 8. Messier 42, the Great Nebula in Orion
UKS 23. Faint nebulosity near Orion and Horsehead Nebulae
AAT 19. The Orion Nebula, M42, and M43
AAT 29. The Trapezium stars in the Orion Nebula
AAT 30. The stars that excite the Trifid Nebula
AAT 31. The Hourglass Nebula in Messier 8
UKS 5. The Lagoon Nebula, Messier 8
UKS 6. The Great Nebula in Carina, NGC 3372
AAT 9. The nebula in Carina, NGC 3372
AAT 32. Eta Carinae and the Keyhole Nebula
AAT 37. The Carina Nebula and Trumpler 14
AAT 33. The Henize 70 Nebula in the LMC
UKS 9. The Rosette Nebula and NGC 2244 cluster
AAT 35. The Rosette Nebula and NGC 2244
AAT 36. The Horsehead Nebula and NGC 2023
UKS 1. The Horsehead Nebula in Orion
AAT 38. NGC 3576 and 3603, nebulae in Carina
AAT 39. The loops of the NGC 3576 nebula
AAT 40. Reddened nebulosity in NGC 3603
UKS 15. The 30 Doradus Nebula in the LMC
AAT 44. The Tarantula Nebula around 30 Doradus
AAT 68. The region of 30 Doradus in the LMC
AAT 69. Reflection nebulosity around M20
AAT 74. Reflection nebula in NGC 6188
AAT 77. A group of dark Bok globules in IC 2944
UKS 22. The Milky Way south of Messier 17
AAT 85. NGC 6618, the emission nebula Messier 17
AAT 86. Bubble nebulae in NGC 6822
UKS 3. NGC 6559 and IC1274-5 in Sagittarius
UKS 10. NGC 6334 and NGC 6357 in Scorpius
UKS 11. NGC 6334, a reddened nebula in Sco
UKS 12. NGC 6357, a reddened nebula in Sco
UKS 27. Henize 55 in the Large Megellanic Cloud
UKS 28. Henize 44 in the Large Megellanic Cloud
INT 9. NGC 6914, emission and reflection nebulosity
INT 12. The dust cloud associated with NGC 281 and IC 1590