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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

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Hubble constant

Their findings, published on April 10 in Astronomy & Astrophysics, place the Hubble constant at 73.50 ± 0.81 kilometers per second per megaparsec, achieving a precision slightly better than 1%.

From Science Daily ● Apr. 12, 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

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

The team showed that if the Hubble constant were lower, the total observable volume of the universe would also be smaller.

From Science Daily ● Mar. 1, 2026

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