Image Tags
Orion Nebula space nebula stars constellation astronomy Messier 42 M42 NGC 1976 diffuse nebula emission nebula reflection nebula Horsehead Nebula Barnard's Loop interstellar dust interstellar gas ionized gas hydrogen helium oxygen nitrogen sulfur ionized hydrogen H II region star formation stellar nursery open cluster NGC 1980 Trapezium Cluster hot stars massive stars young stars variable stars protostars brown dwarfs exoplanets habitable zone supernova remnant planetary nebula white dwarf black hole neutron star quark star strange star dark matter dark energy