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“One bad measurement” ruled out as Hubble tension explanation

Big Think·Ethan Siegel·about 2 months ago
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“One bad measurement” ruled out as Hubble tension explanation The distance ladder and the CMB give incompatible values for the expansion rate. A new study shows just how robust the Hubble tension is. April 13, 2026 This graphic represents the tension that exists between measurements of the expansion rate of the late, nearby Universe, versus what would be expected based on measurements of the early Universe. These two approaches are expected to yield the same result, but they don’t. This discrepancy is known as the Hubble tension, and is represented in this graphic by the misalignment between the Early Route and Late Route bridges, yielding incompatible values for the expansion rate of 67 km/s/Mpc and 73 km/s/Mpc, with an error of 1% or less on each one. Credit : NOIRLab/NSF/AURA/J. da Silva/J. Pollard For the past 15 years, two fundamentally different ways of measuring the expansion rate of the Universe, either through an early relic signal or a distance ladder method, have given incompatible results.…

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