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Hubble Edwin Powell

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Hubble  (hbl), Edwin Powell 1889-1953.
American astronomer who demonstrated that there are galaxies beyond our own and that they are receding from ours, providing strong evidence that the universe is expanding. Hubble also established the first measurements for the age and radius of the known universe, and his methods for determining them remain in use today.
See Note at big bangDoppler effect
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