Cosmic Clocks Diverge: A New Mystery of the Universe's Expansion ⚡ экспресс
Original: "Two per cent measurement of $$H_0$$ from Cepheids alone"
Measuring the expansion rate using Cepheids yielded 71.1 (km/s)/Mpc — the conflict with other methods has only intensified.
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The expansion rate of the Universe has been measured again. The new number — 71.1 km/s/Mpc — is almost 2 lower than the former 'gold standard'. The discrepancy with the Planck satellite data has become even more significant. This hints at gaps in our knowledge of the cosmos.
🎯 Edwin Hubble's first measurement in 1929 gave about 500 km/s per megaparsec — seven times larger than today's, because he didn't know about the two types of Cepheids.
v = H_0 d
A galaxy's recession speed increases with distance: the farther away, the faster it moves.