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NASA’s Hubble spots nearly invisible “ghost galaxy” made of 99% dark matter
General • February 21, 2026
Astronomers have
uncovered one of the most
mysterious galaxies ever found — a dim, ghostly
object called CDG-2 that is almost entirely made of dark matter. Located 300 million light-years away in the Perseus galaxy cluster, it was discovered in an unusual way: not by its stars, but by four tightly packed globular clusters acting like cosmic breadcrumbs.
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