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Galaxies

Galaxy Formation Supermassive Black Holes Early Universe Active Galactic Nuclei Black Holes High-Redshift Galaxies Quasars Gravitational Lensing Starburst Galaxies Galaxy Evolution Hidden Galaxies Sombrero Galaxy Compact Galaxies Bullet Cluster High-redshift Galaxies Early Galaxies Compact Objects HELM Galaxies Lyman-Alpha Emission NGC 4141 Star Formation Milky Way Black Hole Stars Quiescent Galaxies Large-Scale Structure Star-Forming Galaxies Lyman Continuum Escape Emission-line Galaxies Stellar Dynamics Supernovae Photometric Redshift Distant Galaxies Circumgalactic Medium Galaxy M87 M87 NGC 1052 Cosmology Dwarf Galaxies

Global VLBI Detects Lowest-Mass Dark Object at Cosmological Distance

Using gravitational imaging of a lensed radio arc, researchers measured a roughly one‑million‑solar‑mass perturber with no detected light.