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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...

Practice Midterm #2


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 ...

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


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 ...

The Hubble Constant - Caltech Astronomy


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 ...

HubbleSite - NewsCenter - Hubble Space Telescope Measures ...


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.

How Old is the Universe? - 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 Expansion of the Universe - Cseligman.com


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...

The Age of the Universe - UC Berkeley Astronomy w


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...

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


Astronomers have used Hubble to observe Cepheids with extraordinary results. ... 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 Hubble Law | Answers in Genesis


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 ...

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WMAP- Age of the Universe - Wilkinson Microwave Anisotropy Probe


Dec 21, 2012 ... Astronomers estimate the age of the universe in two ways: 1) by ... The Hubble constant is a measure of the current expansion rate of the ... If the astronomers who have measured the smaller values of the Hubble constant are ...

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


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...

Steps to the Hubble Constant - Astronomy Notes


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.