What is Dark nebula?
'''Dark nebulae''' are [[astronomical object]]s. They do not emit or reflect light. They are seen when they hide stars and galaxies behind them. The astronomer [[Edward Emerson Barnard]] compiled a list of dark nebulae known as the ''Barnard Catalogue of Dark Markings in the Sky'', or the '''''Barnard Catalogue''''' for short. The nebulae listed by Barnard have become known as '''Barnard objects'''.<ref>{{citation|title=Optical data for selected Barnard objects|last1=Bok|first1=B.J.|last2=McCarthy|first2=C.C.|journal=Astronomical Journal|volume=79|page=42|year=1974|doi = 10.1086/111527 }}.</ref> These are the best-known dark nebulae: [[File:The Horsehead Nebula IC434.jpg|thumbnail|The Horsehead nebula]] * [[Coalsack nebula]] * [[Cone nebula]] * [[Dark Doodad nebula]] * [[Dark Horse (astronomy)|Dark Horse nebula]] * [[Horsehead nebula]] ([[Barnard 33]]) * [[Pipe nebula]] (also see [[Dark Horse (astronomy)|Dark Horse nebula]]; includes [[Barnard 59]], [[Barnard 77|77]] and [[Barnard 78|78]]) * [[Snake nebula]] (also see [[Dark Horse (astronomy)|Dark Horse nebula]] == References == {{reflist}} {{science-stub}} [[Category:Nebulae| ]]