Which are the two factors that are related to one another according to Hubble's law ?

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Extra galasticspace and doppler shift messure galaxies.
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Density expansion Critical density
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Recessional velocity and distance.
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Hubble's law is the name for the observation in physical cosmology that: (1) objects observed in deep space (extragalactic space, ~10 megaparsecs or more) are found to have a Doppler shift interpretable as relative velocity away from the Earth; (2) that this Doppler-shift-measured velocity, of various...
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Hubble's law is the name for the observation in physical cosmology that: (1) objects observed in deep space (extragalactic space, ~10 megaparsecs or more) are found to have a Doppler shift interpretable as relative velocity away from the Earth; (2) that this Doppler-shift-measured velocity, of various galaxies receding from the Earth, is approximately proportional to their distance from the Earth for galaxies up to a few hundred megaparsecs away. read less
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(1) Objects observed in deep space are found to have a Doppler shift interpretable as relative velocity away from the Earth. (2) That this Doppler-shift-measured velocity, of various galaxies.
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objects observed in deep space (extragalactic space, ~10 megaparsecs or more) are found to have a Doppler shift interpretable as relative velocity away from the Earth.
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The law is often expressed by the equation v = H0D, with H0 the constant of proportionality (Hubble constant) between the "proper distance" D to a galaxy (which can change over time, unlike the co moving distance) and its velocity v (i.e. the derivative of proper distance with respect to cosmological...
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The law is often expressed by the equation v = H0D, with H0 the constant of proportionality (Hubble constant) between the "proper distance" D to a galaxy (which can change over time, unlike the co moving distance) and its velocity v (i.e. the derivative of proper distance with respect to cosmological time coordinate; see Uses of the proper distance for some discussion of the subtleties of this definition of 'velocity'). So the factors are velocity and Distance D. read less
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