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Hubble's law - Wikipedia


Hubble's law is the name for the observation in physical cosmology that: Objects observed in ..... The subscript '0' indicates the value of the Hubble constant today. Current evidence su...

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 ...

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 ...

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 ...

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.

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 ...

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...

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 an expanding universe


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.

The Hubble Constant


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:.

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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 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...

The Hubble Constant - Teach Astronomy


The slope of the plot, the ratio of velocity to distance, is known as the Hubble constant. ... measures the rate of the expansion, and it also indicates the size and age of the universe. ... How do astronomers estimate the Hubble constant? ... Hubble's first measurements yielded a very steep slope and a high value for H0: 540 ...