Although dark matter cannot be seen, it can be studied by the gravitational effect of dark objects on the light from background stars. New observations of the nearby Andromeda galaxy probe the possibility that the dark matter could be small black holes.
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Carr, B.J. The light side of dark matter. Nat Astron 3, 485–486 (2019). https://doi.org/10.1038/s41550-019-0792-1
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DOI: https://doi.org/10.1038/s41550-019-0792-1
