Chinese astronomers have found evidence of a "dark" galaxy: 98% dark matter, 2% hydrogen, and almost no stars at all.
It showed up in their radio telescope, but when they looked for the light from its stars they saw...nothing.
https://www.sciencealert.com/mysterious-dark-galaxy-emits-no-visible-light-scientists-say #cosmology #DarkMatter
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In the episode Cathexis (St Voyager Season 1) they come across a dark matter nebula
