Astrophysical maser

naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum

Cotton Candy Nebula Calabash Nebula Mira MR 22 M1-92 Frosty Leo Nebula Water Lily Nebula Markarian 231 Messier 106 W43A W33A IRAS 17163-3907 R Leonis

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