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Ursa Major III: a stable star cluster or the smallest known satellite galaxy?

Summary by scientias.nl
Ursa Major III/UNIONS 1 (UMa3/U1) contains only about 60 stars. New simulations show that such a system can survive for billions of years without hosting dark matter and that the high velocity distribution can be explained by compact stellar remnants and binary stars. Sometimes it is not easy to determine whether a collection of stars is a dwarf galaxy […] More science? Read the latest articles on Scientias.nl .
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scientias.nl broke the news in Middelharnis, Netherlands on Monday, May 12, 2025.
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