The Perseus Cluster, 240 million light-years away, which plays a B, 57 octaves below middle C. Two d
The Perseus Cluster, 240 million light-years away, which plays a B, 57 octaves below middle C. Two days ago, it was announced that a mysterious X-ray signal emanating from the galactic cluster could be a sign of a dark matter candidate, a sterile neutrino. js -- source link
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