How heavy is the universe? Conflicting answers hint at new physics.

Two entirely different ways of “weighing” the cosmos are producing disparate results. If more precise measurements fail to resolve the discrepancy, physicists may have to revise the standard model of cosmology, our best description of the universe.

“If this really is a glimpse of the standard model breaking down, that would be potentially revolutionary,” says astronomer Hendrik Hildebrandt of the Ruhr University Bochum in Germany.

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