
Realm of the Nebulae
Edwin Hubble, Sean M. Carroll, Robert Kirshner
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by Edwin Hubble, James Gunn
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No modern astronomer made a more profound contribution to our understanding of the cosmos than did Edwin Hubble, who first conclusively demonstrated that the universe is expanding. Basing his theory on the observation of the change in distanct galaxies, called red shift, Hubble showed that this is a Doppler effect, or alteration in the wavelength of light, resulting from the rapid motion of celestial objects away from Earth.
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