Astronomers have now imaged a stellar microlens as it speeds across the sky. A similar effect will soon allow them to measure the mass of a lens, whether dark or luminous.
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Gould, A. Gravitational microlens in motion. Nature 414, 591–593 (2001). https://doi.org/10.1038/414591a
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DOI: https://doi.org/10.1038/414591a
