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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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Currently, astronomers rely on two main approaches to measure the Hubble constant, but they do not agree with each other.

From Science Daily • Apr. 29, 2026

Different methods produce conflicting values for the Hubble constant, the number used to describe how fast the universe is expanding.

From Science Daily • Mar. 16, 2026

"To measure the Hubble constant using time-delay cosmography, you need a really massive galaxy that can act as a lens," said Wong.

From Science Daily • Dec. 9, 2025

Scientists have developed several methods to estimate the Hubble constant, but until now they have all relied on so-called distance ladders.

From Science Daily • Dec. 9, 2025

Almost the only thing constant about the Hubble constant has been the amount of disagreement over what value to give it.

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