After all this matter was perhaps not dark, but thinly spread out in very low density over an enormous intergalactic space! This was apparently discovered by exploiting another long-term paradox called fast radio bursts (FRB). Space is still largely a universal mystery!
" ... The average density of matter between the Milky Way and each of the five FRB host galaxies came out to about one baryon per cubic meter. The material in the Milky Way is about 1 million times as dense as that ... "
The missing half of ordinary matter in the universe has turned up | Science News
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