Universe’s expansion rate: ‘Something doesn’t add up’
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An international collaboration of astronomers has produced one of the most precise measurements yet of the local universe’s expansion rate, out to about 1 billion light-years. And the new measurements confirm a persistent mismatch that could point to physics beyond current models. This image – an artist’s concept – represents the cosmic distance ladder. It’s the idea that astronomers “stairstep” from distances they can measure to unknown distances in the
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