Hubble constant

British  

noun

1. 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

---

Example Sentences

See Examples For:

Hubble constant

Together, these improvements help us measure the Hubble constant more precisely than ever before using gravitational waves, bringing us closer to understanding one of modern physics' most important open questions.

From Science Daily ● Jul. 2, 2026

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

This research is presented in a paper titled "The Local Distance Network: A community consensus report on the measurement of the Hubble constant at ∼1% precision" to published in Astronomy & Astrophysics.

From Science Daily ● Apr. 12, 2026

"This isn't just a new value of the Hubble constant," the collaboration notes, "it's a community-built framework that brings decades of independent distance measurements together, transparently and accessibly."

From Science Daily ● Apr. 12, 2026

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