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Hubble's constant

noun, Astronomy
1.
the ratio of the recessional velocity of galaxies to their distance from the sun, with current measurements of its value ranging from 50 to 100 km/sec per megaparsec.
Origin
1950-1955
1950-55; after E. P. Hubble
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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