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A Hundred Radio Flashes From Deep Space Have Given Astronomers a New Way to Weigh the Universe's Missing Matter

Fast radio bursts last a millisecond and arrive smeared by everything they pass through. Caltech's Kritti Sharma and Vikram Ravi used that smear from about a hundred of them to measure how clumpy the gas between galaxies is. It is smoother than anyone thought.

Sep 15, 2026