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## Age of the universe

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...

## 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...

## What Is The Hubble Constant? - Space.com

www.space.com/25179-hubble-constant.html

Mar 21, 2014 ... The Hubble Constant is the unit of measurement used to describe the expansion of the universe. ... As of March 2013, NASA estimates the rate of expansion is about ... variables) and WMAP, which extrapolated based on measurements of ... This pegged the universe at about 12 billion years old (which has ...

## 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 ...

## Practice Midterm #2

www.ucolick.org/~hyesuf/teaching/ay1_2011/practice_midterm_2.pdf

than it is today while the energy density of radiation in the Universe at that time ... Based on current estimates of the value of Hubble's constant, how old is the ...

## 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 ... with a best value of 72 km/sec/Mpc. More recently, the Hubble Constant ... so the new measurements imply an universe age of about 14 billion years.

## The Hubble Constant - Caltech Astronomy

www.astro.caltech.edu/~george/ay127/readings/FreedmanMadore2010.pdf

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 ...

## 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, ... Its value has obsessed astronomers for decades, and yet it is still not known for sure. .... the Hubble law is then used to estimate distances of galaxies that are ...

## The Expansion of the Universe - Cseligman.com

cseligman.com/text/galaxies/universe.htm

This value of the Hubble constant is just an estimate, as it is hard to measure ... Time since "close" to us = current distance / current speed = r / Vr = r / H r = 1 / H ... The value of 65 km/sec/Mpc implies an "age" for the Universe of 15 billion years. ..... quoting are based on the assumption that the mass of th...

## HubbleSite - NewsCenter - Hubble Space Telescope Measures ...

hubblesite.org/newscenter/archive/releases/1994/49/background/

Oct 26, 1994 ... (To calculate the Hubble Constant, astronomers also need to know how fast a galaxy ... In the past, the best ground-based observations have detected Cepheids in ... because it is needed to estimate the size and age of the universe. ... distance from earth, and Ho is the current value of the Hubble Constant.

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

www.spacetelescope.org

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 the Universe - UC Berkeley Astronomy w

w.astro.berkeley.edu

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...

### The Hubble Constant

www.cfa.harvard.edu

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:.