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Space, the final frontier@lemmy.mlEnglish · 4 months ago

Why 21 cm is our Universe's "magic length"

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Why 21 cm is our Universe's "magic length"

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Space, the final frontier@lemmy.mlEnglish · 4 months ago

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Photons come in every wavelength you can imagine. But one particular quantum transition makes light at precisely 21 cm, and it's magical.

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