Hubbles law ep hubble 1925a relationship discovered among, Ask an Expert

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Hubble's law (E.P. Hubble; 1925):

A relationship discovered among distance & radial velocity. Further away a galaxy is away from is, the quicker it is receding away from us. The constant of proportionality is Hubble constant, H₀. The cause is interpreted such as the expansion of spacetime itself.

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