Hubble's Parameter (Noun)
Meaning
(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today.
Classification
Nouns denoting quantities and units of measure.
Examples
- The Hubble's parameter value is crucial in understanding the rate at which the universe is expanding and how it has evolved over time.
- Hubble's parameter has been the subject of extensive research in cosmology, as it holds the key to understanding the dynamics of the universe.
- By analyzing the redshift of light from distant galaxies, astronomers can estimate Hubble's parameter and gain insights into the expansion history of the universe.
- Hubble's parameter is often expressed in units of kilometers per second per megaparsec, which represents the rate at which galaxies are moving away from us.
- A precise measurement of Hubble's parameter is essential for understanding the properties of dark energy, which is thought to be driving the accelerating expansion of the universe.