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NinjaZ@infosec.pub to Physics@mander.xyz · 7 months ago

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

bigthink.com

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

bigthink.com

NinjaZ@infosec.pub to Physics@mander.xyz · 7 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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