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by allemagne
428 days ago
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The article does say "precisely 21cm" in the subtitle, repeats it in the "key takeaways" section, and then close to the end of the article these's this: >By measuring light of precisely the needed wavelength — peaking at precisely 21.106114053 centimeters Which I assume is the actual measurement every time "21cm" is brought up in this article. |
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