Emission Nebulae (H II)

Emission nebulae are interstellar clouds of gas and dust that emit light in various wavelengths due to the excitation of their atoms by high-energy radiation, such as ultraviolet light from nearby hot stars. When an atom in the nebula is excited by this energy, it absorbs the energy and then releases it in the form of light of a specific wavelength, creating a bright emission line in the nebula's spectrum.

The most common type of emission nebulae are H II regions, which are clouds of ionized hydrogen gas. H II regions are typically found in the vicinity of hot, young stars that emit intense ultraviolet radiation. The radiation ionizes the gas atoms in the nebula, stripping them of their electrons and causing them to emit light in various colors, such as red, blue, and green.

Emission nebulae can take on a variety of shapes and sizes, from small knots of gas and dust to large, diffuse clouds that span hundreds of light-years. They often have intricate structures, with filaments and loops of gas and dust that are sculpted by the strong radiation and magnetic fields within the nebula.
Rosette Nebula - Caldwell 49 - C49

Caldwell 49 – Rosette Nebula

The Rosette Nebula, situated in the constellation Monoceros, is a vast region of glowing hydrogen gas and dust illuminated by the open star cluster NGC 2244, creating its distinctive rosette-shaped appearance ...
Pelican Nebula - IC 5070

IC 5070 – Pelican Nebula

The Pelican Nebula, also known as IC 5070, is an emission nebula located in the constellation Cygnus. It is a large region of glowing gas and dust where new stars are being born ...
Eagle Nebula - M16 - Messier 16 - NGC 6611 - Sh2-49 - Sharpless 49 - Melotte 198

Messier 16 – Eagle Nebula

The Eagle Nebula, also known as Messier 16, is an emission nebula located in the constellation Serpens, renowned for its striking "Pillars of Creation," vast columns of interstellar gas and dust where new stars are forming ...
Orion Nebula - M42 - Messier 42

Messier 42 – Orion Nebula

The Orion Nebula is a diffuse nebula in the Orion constellation and a well-known region of star formation, where an active region of interstellar matter can be found that is illuminated by young, hot stars ...
De Marian's Nebula, Messier 43

Messier 43 – De Marian’s Nebula

Messier 43, De Mairan's Nebula, is an emission nebula situated within the prominent Orion constellation ...
Sharpless 86 - NGC 6823

Sharpless 086

Sharpless 86 is a bright emission nebula in the constellation Cepheus, located approximately 2,100 light-years away from Earth ...
Elephant's Trunk Nebula -Sharpless 131 - Sh2-131

Sharpless 131 – Elephant’s Trunk Nebula

The Elephant Trunk Nebula is a dense region of interstellar gas and dust located in the constellation Cepheus, characterized by its elongated shape resembling an elephant's trunk ...
SH2-142, Wizard Nebula, NGC 7380

Sharpless 142 – Wizard Nebula

The Wizard Nebula, also known as NGC 7380, is a vibrant emission nebula located in the constellation Cepheus ...
Monkey Head Nebula - Sharpless 252 - Sh2-252 - NGC 2174

Sharpless 252 – Monkey Head Nebula

NGC 2174, known as the Monkey Head Nebula, is a visually captivating emission nebula located in the constellation Orion, characterized by its intricate structures of ionized hydrogen gas illuminated by nearby young stars ...
Flame Nebula, NGC 2024, Sharpless 277

Sharpless 277 – Flame Nebula

The Flame Nebula (SH2-277) is an illuminated emission nebula located in the constellation Orion, characterized by its striking reddish hues and intricate, flame-like structures ...