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Hubble constant

British

noun

Also called: Hubble parameter. the rate at which the expansion velocity of the universe depends on distance away. It is currently estimated to lie in the range 60–80 km s ^–1 megaparsec ^–1

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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To determine how fast it is growing today, scientists calculate a value called the Hubble constant.

From Science Daily • Mar. 1, 2026

Until then, increasingly strict limits on the background signal will continue to narrow the possible range of the Hubble constant.

From Science Daily • Mar. 1, 2026

Ideally, all these techniques would point to the same Hubble constant.

From Science Daily • Mar. 1, 2026

Over decades of observations of many such objects, the allowed range for the Hubble constant has become narrower.

From Science Daily • Dec. 9, 2025

Thus when astronomers refer to a Hubble constant of 50, what they really mean is "50 kilometers per second per megaparsec."

From "A Short History of Nearly Everything" by Bill Bryson

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023