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- DictionaryHub·ble's con·stant
noun
- 1. the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer. The reciprocal of the constant is called Hubble time and represents the length of time for which the universe has been expanding, and hence the age of the universe.
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Hubble’s original estimate was 500 km/s/Mpc, or about seven times the value astronomers think it is today. Generations of astronomers have improved upon Hubble’s original methods and developed new ones, bringing down the Hubble constant to around 70 km/s/Mpc, but there’s still a long way to go.
Apr 5, 2024 · Hubble constant, in cosmology, constant of proportionality in the relation between the velocities of remote galaxies and their distances. It expresses the rate at which the universe is expanding. It is denoted by the symbol H0, where the subscript denotes that the value is measured at the present time, and named in honour of Edwin Hubble, the ...
- The Editors of Encyclopaedia Britannica
Aug 28, 2018 · The Hubble Constant is the unit of measurement used to describe the expansion of the universe. The cosmos has been getting bigger since the Big Bang kick-started the growth about 13.82 billion ...
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Dec 3, 2019 · The Hubble constant describes how fast the universe is expanding, but researchers don't agree on the constant's value.(Image credit: Shutterstock) The Hubble constant is a unit that describes how ...
The Hubble Constant is a unit used to describe expanding spacetime, which is defined as speed (kilometres per second) over a given distance (per megaparsec). As part of an equation called Hubble's Law, it describes an accelerating expansion of distance between all points in the Universe. In theory, the constant's value is calculated by ...
Hubble's law can be easily depicted in a "Hubble diagram" in which the velocity (assumed approximately proportional to the redshift) of an object is plotted with respect to its distance from the observer. A straight line of positive slope on this diagram is the visual depiction of Hubble's law. Cosmological constant abandoned
Interpretation of Redshift And Distance. Above is the linear relationship between the redshift and distance and the mathematical expression for Hubble’s law as follows: v = Hο D. Where, v is the recessional velocity in km/s. Hο is is Hubble’s constant. D is the proper distance between the galaxy and the observer. Redshift formula.
