Hubble constant h0 ep hubble 1925the constant that, Ask an Expert

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Hubble constant; H0 (E.P. Hubble; 1925):

The constant that determines the relationship among the distance to a galaxy and its velocity of recession because of the expansion of the Universe. As the Universe is self-gravitating, it is not constant truly. In cosmology, it is described as

H = (da/dt)/a,

where a refer to the 4-radius of the Universe. While evaluated for the present, it is written

H₀ == H(t = now).

The Hubble constant is not known to great correctness (only about a factor of 2), however is supposed to lie somewhere among 50 and 100 km/s/Mpc.

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