https://www.newscientist.com/article/2171222-clouds-of-spinning-diamonds-around-stars-solve-an-old-mystery/

COBE saw the expected background radiation, but it also captured emissions of microwaves whose source couldn’t be explained. With wavelengths of a centimetre or so, and frequencies of 10 to 60 gigahertz, the “anomalous microwave …

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