Milky Way Galaxy, Emission nebulas
A conspicuous component of the Galaxy is the collection of large, bright, diffuse gaseous objects generally called nebulas. The brightest of these cloudlike objects are the emission nebulas, large complexes of interstellar gas and stars in which the gas exists in an ionized and excited state (with the electrons of the atoms excited to a higher than normal energy
posted by BoilingOven @ 4:15 PM
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