Hubble constant


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Hubble constant

n
(Astronomy) 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. Also called: Hubble parameter
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Noun1.Hubble constant - (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
cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe
constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
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Applying this calibration to the elliptical galaxies in the Coma cluster, the team found a distance of about 345 million light-years and a Hubble constant between 61 and 77 kilometers per second per megaparsec (1 parsec is 3.
where H is the Hubble constant although the redshifts of distant galaxies will deviate from this linear law with a slightly different constant.
Like contestants in a never-ending tennis match, teams of cosmologists continue to argue back and forth about the numerical value of the Hubble constant.
2]) gives a Hubble constant directly in term of the age of our own galaxy.
The new view of Ia supernovas promises to narrow the gap between teams of researchers who ascribe widely different values to the Hubble constant, a measure of the expansion rate, age, and size of the universe (SN: 10/8/94, p.
The distance depends on the much-debated value of the Hubble constant, a number that provides a measure of both the universe's rate of expansion and its age.
He is using a class of exploding stars known as type la supernovas to track the expansion rate of the universe, a number known as the Hubble constant (SN: 4/5/14, p.
We are interested in a special class of cosmological models: cosmologies with a Hubble constant that does not vary over time to conform to the linear relationship between the luminosity distance and the redshift observed for Type Ia supernovae [1].
The scientists say that comparing radio and gamma-ray observations of additional lens systems could help provide new insights into the workings of powerful black-hole jets and establish new constraints on important cosmological quantities like the Hubble constant, which describes the universe's rate of expansion.
The Hubble constant is a fundamental quantity that measures the current rate at which our universe is expanding.
Summary: TEHRAN (FNA)- Astronomers using NASA's Spitzer Space Telescope have announced the most precise measurement yet of the Hubble constant, or the rate at which our universe is stretching apart.
the distance scale through the Hubble constant, and the ages of stars.