Hubble's law  From Wikipedia, the free encyclopedia
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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; and (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.[1][2] This is normally
interpreted as a direct, physical observation of the expansion
of the spatial volume of the observable universe.[3]  The motion
of astronomical objects due solely to this expansion is known as
the Hubble flow.[4] Hubble's law is considered the first
observational basis for the expanding space paradigm and today
serves as one of the pieces of evidence most often cited in
support of the Big Bang model.  Although widely attributed