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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By carefully measuring these delays, scientists can calculate the current expansion rate of the universe, known as the Hubble constant.

From Science Daily • Apr. 29, 2026

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

The value of 73 km/s/Mpc for the Hubble constant agrees with observations of relatively nearby objects.

From Science Daily • Dec. 9, 2025

"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

De Vaucouleurs was equally certain that the Hubble constant was 100.*

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