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...

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 ...

cosmictimes.gsfc.nasa.gov/teachers/guide/age_size.html

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 ...

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 ...

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.

www.space.com/24054-how-old-is-the-universe.html

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.

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...

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...

www.spacetelescope.org/science/age_size/

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.

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 ...