Definition: Hubble constant; (E.P. Hubble; 1925): The constant which determines the relationship between the distance to a galaxy and its velocity of recession due to the expansion of the Universe.
I've been trying to figure out exactly what the Hubble Constant is for quite a while. I know that it has to do with the expansion rate of the Universe and that it can also directly yield the distance scale and the age of the Universe.
Hubble Constant (H): A measure of the rate of expansion of the Universe; current estimates are about 70 km/s/megaparsec.
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HUBBLE CONSTANT (H0) - Constant in the linear relationship between the distance to a galaxy (R) and the velocity with which that galaxy is receding from us (v) due to the overall expansion of the universe: ...
Hubble Constant
(a) The present expansion rate of the universe, in units of kilometers per second per megaparsec. The larger the Hubble constant, the younger the universe.
HUBBLE CONSTANT
The Hubble Constant, H0 is the number (not actually a constant) which shows the rate at which the universe is expanding.
Hubble constant
A measure of the rate of expansion of the universe. The average value of velocity of recession divided by distance. Presently believed to be between 50 and 100 km/s/Mpc.
Hubble time ...
Hubble Constant (Ho)
A number that expresses the rate at which the universe expands with time. Ho appears to be between 60 and 75 kilometers per second per megaparsec.
Hubble Space Telescope (HST) ...
Hubble Constant
Andrew Braybrook
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Hubble Constant
The relationship between the distance of an object, and the speed at which it is traveling away from us. The further away an object is the faster away from us it is traveling.
Inferior planets ...
Hubble constant - (n.)
The numerical factor, usually denoted H, that describes the rate of expansion of the universe.
Hubble Constant: The constant of proportionality (designated H) between recession velocity and distance in the Hubble law. It is a constant of proportionality but not a constant in time, because it can change over the history of the universe.
The Hubble constant is calculated by measuring the speed at which objects are moving away from us and dividing by their distance.
The Hubble constant is one of most important numbers in cosmology. Going back to Hubble's law, you can see that the constant is velocity divided by distance.
The Hubble constant and extragalactic distance scale (1)
Feb 17
The Hubble constant and extragalactic distance scale (2) ...
The Hubble Constant is a pretty important thing. Why can't we figure out what its value is simply? It is easy, isn't it? No, it is not easy at all, but is a rather complex step-by-step process. There are many places to mess up in the process.
7. A Hubble constant of 65 km/s/Mpc gives a maximum age for the universe of _____ billion years. (Hint)
8. _____ is slowing the expansion of the universe. (Hint) ...
(287) The Hubble Constant
(290) Black Holes
(301) "The Standard Model of the Universe" ...
Steps to the Hubble Constant
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where H is the Hubble constant and G is Newton's gravitational constant.
Attempts to measure the actual density of the Universe have basically followed one of two methods: ...
Hubble constant (NASA Thesaurus) The rate at which the velocity of recession of the galaxies increases with distance.
The Hubble constant H_0 has units of inverse time. We can therefore define 'Hubble time' as 1/H_0. The value of Hubble time in the standard cosmological model is 4.35Ã-1017 s or 13.8 billion years, somewhat longer than the current age of the universe.
(c) A possible third parameter in cosmology, in addition to the Hubble constant and omega ().
The critical density of the universe for this value of the Hubble constant is 3 H2/8 pi G, which works out to be 1×10−29 grams/cubic centimeter or about 5×10−6 atoms of hydrogen/cc.
Scientists in Cambridge spent 3 years calculating one of the fundamental keys to the universe - The Hubble Constant that determines the age of the universe.
With the rate at which the universe is expanding, called the Hubble constant, astronomers can determine how long ago the universe was at size zero - the age of the universe. In practice, it is not so easy.
The relationship between the redshift of a galaxy and its distance is set by the Hubble constant, which is the ratio of the velocity of a galaxy away from us to its distance.
Recent determinations of the value of the Hubble Constant are resulting in an ever-narrowing range of values. An international team of scientists led by Dr. Wendy Freedman of Carnegie Observatories in Pasadena, Calif.
Sandage, working at the Carnegie Observatories in California, continued his efforts to hone the Hubble Constant, in his latter years using the Hubble Space Telescope to observe extragalactic Type Ia supernovae as standard candles.
75] reflecting the uncertainty in the value of the Hubble constant for the rate of expansion of the universe (h = H / (100 km/s/Mpc)).
The rapid initial expansion has slowed over time, and the current amount, the Hubble constant H0 is 71 kilometers per second per megaparsec as determined by results from WMAP (Wilkinson Microwave Anisotropy Probe).
The Hubble constant has received much attention because its reciprocal can be thought of as a time that represents the age of the universe.
Age of universe and values of omega, Hubble Constant
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The goal was to use the recalibrated scale to calculate a more precise value for the Hubble Constant, H0 which at that time was measured as somewhere between 50 and 100 km s-1 Mpc-1 (kilometres per second per megaparsec) depending on the method used.
relationship has become known as the law of the red shifts, or Hubble's law; it states that the recession velocity of a galaxy is proportional to its distance. The ratio of the recession velocity of a galaxy to its distance (the Hubble constant) is ...
What are some of the standard candles, and under what circumstances is each one useful?
If the Hubble constant is 50 km/sec/Mpc, how far away is a galaxy that has a redshift of z=0.06? What if Ho= 100 km/sec/Mpc? (Recall the relation redshift z=v/c.
 See also: Universe, Galaxies, Distance, Galaxy, Light
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