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by ballenarosada
3022 days ago
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> Hydrogen can absorb or (suitably excited) emit light at 21cm wavelength specifically, better than all other wavelengths. Based on the article, I don't think this is right. http://astronomy.swin.edu.au/cosmos/S/Spin-flip+Transition, linked, describes the 21cm emission as occurring once every 10 million years for a single atom. |
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