A technique for weighing galaxy clusters using distortions of the cosmic microwave background is entering an era of precision measurements.
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Madhavacheril, M.S. The weight of cosmic lenses. Nat Astron 1, 751–752 (2017). https://doi.org/10.1038/s41550-017-0286-y
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DOI: https://doi.org/10.1038/s41550-017-0286-y
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