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| Hub·ble con·stant [ húbb'lz kònstənt ] or Hub·ble's con·stant [ húbb'lz kònstənt ] |
noun |
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| Definition: |
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measure of universe's expansion: the ratio that expresses the rate of the universe's expansion, equal to the speed at which galaxies appear to be moving away from Earth divided by their distance
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| [Mid-20th century. After Edwin Hubble] |
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