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

bigthink.com

cross-posted to:
physics@mander.xyz

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

bigthink.com

RSS Bot@lemmy.bestiver.seMB to Hacker News@lemmy.bestiver.seEnglish · 10 months ago

cross-posted to:
physics@mander.xyz

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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