bigthink.com Why 21 cm is our Universe's "magic length"
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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Space, the final frontier @lemmy.ml ☆ Yσɠƚԋσʂ ☆ @lemmy.ml 
news.cgtn.com China achieves its 1st lunar-distance satellite laser rangingChina on Wednesday successfully conducted its first satellite laser ranging experiment at lunar-distance scales, marking a major technological breakthrough in deep-space exploration.The breakthrough was announced on Friday by the Technology and Engineering
