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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

When they combined the stochastic siren method with existing measurements from individual black hole mergers, they achieved a more precise estimate of 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

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

Ho has been known ever since as the Hubble constant and the whole as Hubble’s Law.

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