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  1. Physics

    Atomic clocks take a step toward redefining the second

    Measurements of the clocks’ frequencies provide the most precise clock comparisons yet, with uncertainties less than a quadrillionth of a percent.

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  2. Astronomy

    A new black hole image reveals the behemoth’s magnetic fields

    A new analysis of Event Horizon Telescope data from 2017 brings to light the magnetic fields twisted around the black hole at the core of galaxy M87.

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  3. Cosmology

    The dark matter mystery deepens with the demise of a reported detection

    Early results from an experiment designed to replicate one that hinted that dark matter is made up of WIMPs came up empty-handed.