The Orion Molecular Cloud Complex

The Orion Molecular Cloud Complex (or, simply, the Orion Complex) is a large group of bright nebulae, dark clouds, and young stars in the Orion constellation. The cloud is between 1 500 and 1 600 light-years [ … ]

N44 located in a satellite galaxy of the Milky Way

N44 is an emission nebula with superbubble structure located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way in the constellation Dorado.   What is the emission nebula N44? Originally catalogued in Karl Henize’s “Catalogue of H-alpha emission stars [ … ]

What is a molecular cloud?

A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit the formation of molecules, most commonly molecular hydrogen (H2).   What [ … ]

The Cygnus Loop, a supernova remnant

The Cygnus Loop  or Sharpless 103 is a large supernova remnant  in the constellation Cygnus, an emission nebula measuring nearly 3° across. Some arcs of the loop, known collectively as the Veil Nebula or Cirrus Nebula, emit in the [ … ]