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Age of the universe - Wikipedia

en.wikipedia.org/wiki/Age_of_the_universe

In physical cosmology, the age of the universe is the time elapsed since the Big Bang. The current measurement of the age of the universe is .... So a rough estimate of the age of the universe comes...

WMAP- Expansion of the Universe

map.gsfc.nasa.gov/universe/uni_expansion.html

Jan 24, 2014 ... The current rate of expansion is usually expressed as the Hubble Constant (in ... discovery was based on comparing his measurements of the Cepheid-based ... the expansion rate (the Hubble constant) and age of the universe. ... values for the Hubble constant that varied between 50 (km/sec)/Mpc and 100 ...

The Age of the Universe | Astronomy 801: Planets, Stars, Galaxies ...

www.e-education.psu.edu/astro801/content/l10_p5.html

If we agree that Hubble's Law tells us that the universe is expanding, it also ... the universe is expanding, because we know the value of Hubble's constant (H0 ) ... You can actually calculate an estimate for the age of the Universe from Hubble's Law. ... you with how long it took for the galaxies to reach their current sep...

The Hubble constant: How old is the universe? - The Economist

www.economist.com/node/208825

May 27, 1999 ... Knowing this number (now called the Hubble constant) enabled the cosmologists of the day to estimate the age of the universe by extrapolating backwards to the Big ... the universe thus made somewhat older—but its exact value has ... Based on the ten clusters he has bagged so far, he, too, agrees with Dr ...

The Age of the Universe - UC Berkeley Astronomy w

w.astro.berkeley.edu/~dperley/univage/univage.html

With the currently accepted value for the Hubble constant Ho of 71 km/s/Mpc, ... of gravity using current measurements of the universe's mass density (including both ... checks on its predictions – in this case, the estimate of the universe's age t 0. ..... with adjustments made to the ages of objects within the universe based on...

Steps to the Hubble Constant - Astronomy Notes

www.astronomynotes.com/galaxy/s16.htm

Aug 4, 2012 ... This method assumes that all Zero-Age main sequence stars of a given ... You can make maps of the large-scale structure of the universe. ... with a best value of 72 km/sec/Mpc. More recently, the Hubble Constant has been ...

The Hubble Constant

www.cfa.harvard.edu/~dfabricant/huchra/hubble/

Hubble's initial value for the expansion rate, now called the Hubble Constant, ... The expansion age of the Universe inferred from this was only 2 Gyr, but by the ... a value of 75 km/s/Mpc, and by the early 1970's estimates from Sandage and his .... want to calcuate parameters based on the best available current numbers:.

The Hubble Law | Answers in Genesis

answersingenesis.org/astronomy/age-of-the-universe/the-hubble-law/

Apr 1, 1995 ... The significance of the Hubble constant is explained, along with the ongoing ... There is great confusion about the universe's age among people, .... the Hubble law is then used to estimate distances of galaxies that are .... Afterward it dropped either directly (a) or exponentially (b) to its current value. Back to ...

Measuring the age and size of the Universe | ESA/Hubble | ESA ...

www.spacetelescope.org/science/age_size/

Today we know the age of the Universe to a much higher precision than before ... of expansion of the Universe, known to astronomers as the "Hubble Constant". ... but began accelerating when the Universe was less than half its current age.

The age of an expanding universe

spiff.rit.edu/classes/phys301/lectures/age/age.html

If we want to estimate distances to galaxies beyond this limit, we need to find a set of ... the current (May, 2005) value of the Hubble constant is somewhere around ... our estimate of the age of the universe based on the Hubble constant? Right.

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Age & Size of the Universe Through the Years - Cosmic Times - NASA

cosmictimes.gsfc.nasa.gov

Jan 4, 2010 ... Our estimate of the age and size of the Universe has changed during ... Hubble's initial value of this constant gives an age of the universe of 2 ...

How Old is the Universe? - Space.com

www.space.com

Dec 20, 2013 ... Scientists determine the age of the universe using two different methods: by ... The life cycle of a star is based on its mass. ... distances to the clusters, which affects estimates of brightness and thus mass. ... Thus, finding the expansion rate of the universe — a number known as the Hubble constant — is key.

The Hubble Constant - Caltech Astronomy

www.astro.caltech.edu

Apr 3, 2011 ... age of Universe, Cepheids, cosmology, distance scale, supernovae ... Our best current estimate of the Hubble constant is 73 ± 2 (random) ± ... Determining an accurate value for Ho was one of the primary motivations for building HST. .... based on entirely independent physics, give results consistent with the ...