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From this perspective, Hubble's law is a fundamental relation between (i) the recessional velocity associated with the expansion of the universe and (ii) the distance to an object; the connection between redshift and distance is a crutch used to connect Hubble's law with observations.
The universe's expansion rate, a figure called the Hubble constant, is measured in kilometers per second per megaparsec, a distance equal to 3.26 million light-years.
Hubble used this approach for his original measurement of the expansion rate, by measuring the brightness of Cepheid variable stars and the redshifts of their host galaxies. More recently, using Type Ia supernovae , the expansion rate was measured to be H 0 = 73.24 ± 1.74 (km/s)/Mpc . [ 22 ]
This cosmic expansion was predicted from general relativity by Friedmann in 1922 [62] and Lemaître in 1927, [65] well before Hubble made his 1929 analysis and observations, and it remains the cornerstone of the Big Bang model as developed by Friedmann, Lemaître, Robertson, and Walker.
Something is changing the expansion rate of the universe, scientists have said. For decades, ... Scientists used the Webb telescope in 2023 to confirm Hubble’s observations, and indicate that ...
There is something missing in our understanding of the Universe to explain its expansion, ... Hubble Tension," which refers to Hubble Space Telescope observations over 30 years that show the ...
In 1929, Hubble and Milton Humason formulated the empirical Redshift Distance Law of galaxies, nowadays known as Hubble's law, which, once the Redshift is interpreted as a measure of recession speed, is consistent with the solutions of Einstein's General Relativity Equations for a homogeneous, isotropic expanding universe. The law states that ...
We still don’t know why different measurements of the rate of the universe’s expansion don’t match. But at least we know we can’t blame the Hubble telescope.