Gaia’s Faintest Stars: Chasing Primordial Black Holes in the Galactic Backyard

Jeremy Mould’s study used Gaia data to search for primordial black holes (PBHs) among the faintest nearby stars but found none. The dim objects are mostly brown dwarfs, with possible contributions from free-floating planets and compact ultracool dwarfs. Future detection of PBHs will likely rely on microlensing with more powerful telescopes like Rubin.