Best Hii Region
The Tarantula Nebula, designated as 30 Doradus, is a massive H II region and emission nebula located in the Large Magellanic Cloud. It is the most active starburst region within the Local Group of galaxies, containing a high concentration of massive stars and the dense star cluster R136. The nebula...
Sharpless 2-106 is a bipolar emission nebula located approximately 2,000 light-years from Earth in the constellation Cygnus. The nebula's distinctive hourglass shape is created by jets of gas expelled from a central massive star, with the structure visible in both optical and infrared wavelengths. I...
The Tadpole Nebula is an emission nebula located in the constellation Auriga. It is notable for its distinctive, tadpole-shaped structures of dense gas and dust that are sculpted by stellar winds from a central star cluster. This HII region is a site of active star formation. The nebula is a frequen...
The N44 Nebula is a large emission nebula complex located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. It spans roughly 1,000 light-years and is classified as an H II region, indicating active star formation. The nebula's most distinguishing feature is a massive central superb...
IC 1318 is a sprawling, diffuse emission nebula complex located in the constellation Cygnus, situated near the bright star Sadr. Often referred to as the Butterfly Nebula due to its visually segmented appearance, the glowing gas clouds are dramatically divided by intervening patches of dark interste...
The Gabriela Mistral Nebula, formally cataloged as NGC 3324, is an emission nebula and open star cluster located in the southern constellation of Carina. It is situated on the northwest corner of the larger Carina Nebula complex. The region earned its informal nickname because its eroded dust contou...
N11 is a prominent ring-shaped emission nebula and H II region located within the Large Magellanic Cloud, a satellite galaxy of the Milky Way. Recognized as the second largest star-forming region in the LMC after the Tarantula Nebula, it contains multiple bright clusters of newly formed stars. Its d...
W49A is a giant H II region and one of the most massive star-forming complexes in the Milky Way, located approximately 36,000 light-years away in the constellation Aquila. It contains numerous massive O-type stars and is studied as an analog to distant starburst regions because of its extreme lumino...
The W51 Nebula is one of the most massive and active star-forming H II regions in the Milky Way galaxy. Located approximately 17,000 light-years away in the constellation Aquila, this stellar nursery is characterized by dense clouds of gas and dust where new stars are actively being born. Astronomer...
Westerhout 5 (W5) is a large H II star-forming region located in the constellation Cassiopeia. The interstellar cloud is distinguished by its distinct, hollowed-out cavities, which were sculpted over time by intense stellar winds from central stars. Ultraviolet radiation from these massive stars con...
The W3 Nebula is a massive, complex star-forming region located roughly 6,000 light-years away in the Perseus Arm of the Milky Way. Situated in the constellation Cassiopeia, it is an active H II region where new stars are being born from dense molecular clouds. Astronomers study the nebula extensive...
NGC 2175, commonly referred to as the Monkey Head Nebula, is an H II emission nebula and open star cluster located in the constellation Orion. The massive star-forming region is composed of glowing hydrogen gas and cosmic dust energized by hot, young stars at its center, which carve out distinctive...
The Bubble Nebula, formally NGC 7635, is an emission nebula located in the constellation Cassiopeia. It’s notable for its dramatic appearance created by the intense stellar wind of a massive blue star, BD+60°2522. This wind sculpted a cavity, or bubble, within the interstellar medium. Astronomers an...
The Omega Nebula (Messier 17) is a vast emission nebula located approximately 5,500 light-years from Earth in the Sagittarius constellation. It’s notable for its dramatic, swirling appearance formed by intense star formation within a massive hydrogen ionization region (HII). This active star-forming...
The Rosette Nebula (NGC 2237) is a massive, roughly circular emission nebula located in the constellation Monoceros, approximately 5,200 light-years from Earth. At its center lies NGC 2244, a young open star cluster whose intense stellar radiation ionizes the surrounding hydrogen gas, causing the ne...
The North America Nebula, catalogued as NGC 7000, is a large emission nebula in the constellation Cygnus whose projected outline resembles the continent of North America. William Herschel observed the region in 1786, while later photography by Max Wolf revealed its characteristic form. It lies near...
The Heart Nebula, cataloged as IC 1805, is a large emission nebula located in the constellation Cassiopeia. Its recognizable heart-shaped appearance is formed by ionized hydrogen gas illuminated by radiation from young, massive stars. The central open cluster, Melotte 15, contains several stars that...
The Soul Nebula (IC 1848) is a large emission nebula and active star-forming region located in the constellation Cassiopeia. It is often observed and imaged alongside the neighboring Heart Nebula (IC 1805), with the pair collectively spanning roughly 300 light-years. The nebula's hydrogen gas is ion...
NGC 595 is an expansive H II region within the Triangulum Galaxy, notable for its intense star formation and discovery by astronomer Heinrich d'Arrest in 1861.
The Flame Nebula (NGC 2024) is an emission nebula in the constellation Orion, located approximately 1,400 light-years from Earth. It is part of the Orion Molecular Cloud Complex and is energized primarily by ultraviolet radiation from Alnitak, the easternmost star of Orion's Belt. The nebula contain...
The Pelican Nebula, designated IC 5070, is a large emission nebula located in the constellation Cygnus. It is physically connected to the neighboring North America Nebula, though a dark absorbing molecular cloud separates the two visually. The region is characterized by active star formation and con...
The California Nebula, cataloged as NGC 1499, is a large emission nebula in the constellation Perseus whose elongated outline resembles the shape of California. Ultraviolet radiation from the hot star Xi Persei ionizes hydrogen in the surrounding cloud, causing the nebula to emit strongly at hydroge...
The Pacman Nebula, catalogued as NGC 281, is an emission nebula and H II region in the constellation Cassiopeia. Ultraviolet radiation from young stars in the embedded open cluster IC 1590 ionizes the surrounding hydrogen, producing the nebula's visible glow, while dark dust lanes create its familia...
Westerhout 40 is an obscure star-forming H II region in the Ophiuchus constellation, notable for being one of the nearest massive star-forming regions to Earth.
The Fossil Footprint Nebula is a bright emission nebula in the Perseus arm of the Milky Way, characterized by its glowing gas and discovered in 1786.
NGC 6188, commonly known as the Fighting Dragons of Ara, is a prominent emission nebula and star-forming region located in the southern constellation of Ara, approximately 4,000 light-years away. Its striking, complex structures of dark dust and glowing gas are actively sculpted by the intense ultra...
NGC 6357, commonly referred to as the Lobster Nebula, is a vast emission nebula situated in the constellation Scorpius roughly 8,000 light-years from Earth. It is an active star-forming region characterized by sprawling clouds of gas and dark dust. At its core lies Pismis 24, an exceptionally young...
De Mairan's Nebula, designated as M43, is a star-forming emission nebula located in the constellation Orion. It is situated directly adjacent to and physically connected with the larger Orion Nebula (M42), appearing as a detached portion of the larger complex. The French astronomer Jean-Jacques Dort...
NGC 896 is a bright emission nebula in the constellation Cassiopeia, forming the western portion of the larger Heart Nebula (IC 1805) complex. It is a star-forming H II region whose hydrogen gas is ionized and energized by radiation from the young open cluster Melotte 15, causing it to glow prominen...
