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Black holes weighing as much as an asteroid are too small to be seen by most tests, so they could still make up all the dark matter.","posed_since":"","precise":"For primordial black holes with masses $M = 10^{17} \\text{ to } 10^{22}\\,\\mathrm{g}$, no current constraint excludes a dark-matter fraction $f_{\\mathrm{PBH}} = \\Omega_{\\mathrm{PBH}} / \\Omega_c = 1$. Determine whether $f_{\\mathrm{PBH}} = 1$ is allowed anywhere in this window, via detection (Hawking evaporation products at the light end, femtolensing or microlensing of stars and gamma-ray bursts, dynamical capture in stars) or exclusion of $f_{\\mathrm{PBH}} = 1$ across the whole window for monochromatic and extended mass functions.","problem_ref":"0f19f1f11c99379de3f2b6c8df1a27a59df48ab49bfbd3bfb46d8ab0c44a11a2","references":"","settled_by":"Microlensing surveys and MeV $\\gamma$-ray observations sensitive enough to probe $f_{\\mathrm{PBH}} < 1$ throughout $10^{17}$ to $10^{22}$ g.","status_note":"2026 reviews still list $10^{17}\\ \\text{to}\\ 10^{22}\\,\\mathrm{g}$ as a window where $f_{\\mathrm{PBH}} = 1$ is allowed.","title":"Can asteroid-mass primordial black holes be all the dark 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