H ii region
large, low-density cloud of partially ionized gas
Hourglass Nebula
Fox Fur Nebula
Elephant's Trunk nebula
Rosette Nebula
Cygnus Loop
Crab Nebula
Lagoon Nebula
Eagle Nebula
Omega Nebula
Trifid Nebula
Maffei 1
Soul Nebula
Antares
Celestial Snow Angel
Orion Nebula
Messier 43
Shapley 1
Cone Nebula
DEM L106
Pistol Nebula
Lynx Arc
Crescent Nebula
Tarantula Nebula
Tulip Nebula
Maffei 2
North America Nebula
RCW103
Sh2-308
integrated flux nebula
Prawn Nebula
Heart Nebula
Sh2-239
Mon R2
Gum 15
Gum 19
Seagull Nebula
Stock 16
Sh2-264
Sh2-294
Sh2-284
Sh2-54
Sh2-68
IRAS 12063-6259
Arches Cluster
Ring Nebula
Bubble Nebula
California Nebula
Carina Nebula
Pistol Star
IRAS 18162−2048