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Hubble constant: Quick Facts

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Dr. Edwin P. Hubble stands beside the large 48-inch Schmidt Photographic Telescope at Palomar Observatory, preparing it for a sky survey.
Britannica editor Erik Gregersen, a white man wearing glasses, holds a microphone in front of a galaxy background. Displayed above him are the phrases: Ask an Editor, and How old is the universe?
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Key People

Edwin Hubble
Edwin Hubble
American astronomer

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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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