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According to Live Science (This article and its images were originally posted on Live Science January 2, 2019 at 07:07AM.)
Dark matter, it seems, has been clinging to galaxies for a very long time. Most galaxies that existed 10 billion years ago had about as much dark matter as galaxies do today, contradicting earlier studies that suggested less dark matter lurked around galaxies in the early universe.
“Dark matter was similarly abundant in star-forming galaxies in the distant past as it is in the present day,” said Alfred Tiley, an astronomer at Durham University in England and lead author on the new study. The research was recently submitted to the journal Monthly Notices of the Royal Astronomical Society and published Nov. 16 in the preprint journal arXiv. “It wasn’t a complete surprise, but in reality, we didn’t know whether the observational reality would align with expectations from theory.” [The 11 Biggest Unanswered Questions About Dark Matter]
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