Gravitational lensing is becoming increasingly important to the study of distant galaxies and dark matter. Two groups have recently detected transient events emanating from far-away lensed galaxies, apparently due to extreme magnification of individual stars.
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Di Stefano, R. Cosmic flashing lights. Nat Astron 2, 280–281 (2018). https://doi.org/10.1038/s41550-018-0416-1
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DOI: https://doi.org/10.1038/s41550-018-0416-1