Hubble Constant (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 constant is a fundamental parameter in cosmology that describes the rate at which the universe is expanding.
- Astronomers have been trying to determine the value of the Hubble constant with increasing precision for decades, but it remains a topic of ongoing research and debate.
- The Hubble constant is typically denoted by the symbol H0 and is measured in units of kilometers per second per megaparsec.
- The value of the Hubble constant is crucial for understanding the evolution and fate of the universe, as it determines the rate at which galaxies and other structures are moving away from each other.
- Measurements of the Hubble constant have been made using a variety of methods, including observations of supernovae, the cosmic microwave background radiation, and the large-scale structure of the universe.