Astrophysical maser

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An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum. This emission may arise in molecular clouds, comets, planetary atmospheres, stellar atmospheres, or various other conditions in interstellar space.

Excerpt from the Wikipedia article “Astrophysical maser”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, ESA, and J. Nichols (University of Leicester), Public domain, via Wikimedia Commons.