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CamperBob2
3 months ago
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One quantum transition makes light at 21 cm
1.4 GHz = 21 cm. Masers use the same transition AFAIK.
In fact, natural H-masers have been found:
https://www.cfa.harvard.edu/news/hydrogen-masers-space
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In fact, natural H-masers have been found: https://www.cfa.harvard.edu/news/hydrogen-masers-space