If Ursa Major III/UNIONS 1 is a galaxy, ultra-light dark matter particles must be heavier than 8 x 10^-18 eV, the strongest such bound.
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Updated bounds on ultra-light dark matter from the tiniest galaxies
If Ursa Major III/UNIONS 1 is a galaxy, ultra-light dark matter particles must be heavier than 8 x 10^-18 eV, the strongest such bound.