digplanet beta 1: Athena
Share digplanet:


Applied sciences






















A cosmological decade ( CÐ ) is a division of the lifetime of the cosmos. The divisions are logarithmic in size, with base 10. Each successive cosmological decade represents a ten-fold increase in the total age of the universe.[1]

As expressed in log (seconds per Ðecade)[edit]

When CÐ is measured in log( seconds/Р),  1 begins at 10 seconds and lasts 90 seconds (until 100 seconds after Time Zero).  100, the 100th cosmological decade, lasts from 10100 to 10101 seconds after Time Zero. CР-\infty is Time Zero.

The epoch  −43.2683 was 10(−43.2683) seconds, which represents the Planck time since the big bang (Time Zero). There were an infinite number of cosmological decades between the Big Bang and the Planck epoch (or any other point in time). The current epoch,  17.6389, is 10(17.6389) seconds, or 13.798(37) billion years, since the Big Bang.[2] There have been 60.9 cosmological decades between the Planck epoch, CР−43.2683, and the current epoch, CР17.6389.

As expressed in log (years per Ðecade)[edit]

The cosmological decade can be expressed in log years per decade. In this definition, the 100th cosmological decade lasts from 10100 years to 10101 years after Time Zero. To convert to this format, simply divide by seconds per year; or in logarithmic terms, subtract 7.4991116 from the values listed above. Thus when CÐ is expressed in log( years/Ð ), the Planck time could also be expressed as 10(−43.2683 − 7.4991116) years = 10(−50.7674) years.

In this definition, the current epoch is CÐ (17.6355 − 7.4991116), or CР10.1364. As before, there have been 60.9 cosmological decades between the Planck epoch and the current epoch.

In their view, the history of the universe can be segmented into five eras:

Age Ðecades Process
Primordial −50 to +5 from the Planck time until universe becomes transparent to radiation
Stelliferous 6 to 14 stars shine brightly (our current epoch is +10.1364)
Degenerate 15 to 37 stars degenerate, get dimmer
Black Hole 38 to 99 stars evaporate, galactic black holes evaporate
Dark Era 100 onward lone protons and other particles get even farther and farther apart from each other


  1. ^ Adams, Fred; Greg Laughlin (2000). The Five Ages of the Universe. Free Press. ISBN 0-684-86576-9. 
  2. ^ Planck collaboration (2013). "Planck 2013 results. XVI. Cosmological parameters". Submitted to Astronomy & Astrophysics. arXiv:1303.5076. Bibcode:2013arXiv1303.5076P. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Cosmological_decade — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
175 videos foundNext > 

Life Span of the Universe 1 of 3 HD - Degenerate Era

The Degenerate Era of the Life Span of the Universe - Cosmological Decade - - White Dwarfs - Black Holes ... History Channel's Series : The Universe : Alex F...

Im unbanned from subscribing

Top lel unbanned jewtube cant keep me down total time :8 days, 2 hours, 17 minutes, 43 seconds, 0.0023 milliseconds, 10−6 15 microseconds, 10−9 16345 nanose...

CERN-The growth of cosmological structure

Cosmology and the origin of structure © CERN 2: The growth of cosmological structure Lecture Author(s) Kolb, Edward W ; Treille, Daniel (prod.) (CERN) Affili...

Universe timescales explained - since the Big Bang and after

The vast time spans of the Universe measured in billions and trillions could be simply overwhelming for ordinary humans to comprehend. Scientists Alexei Fili...

Kalam Cosmological Argument - Why it is a bad argument

Kalam Cosmological Argument is a very bad argument even with the contemporary modifications made by some apologists today. Unfortunately some intellectually ...


Explorations in Science Old and New: A TV Series of 25-minute-episodes prepared and presented by Ismail Serageldin (available in Arabic and English) BEYOND E...

Bernard Sadoulet: Shedding Light on the Dark Side of the Universe

Bernard Sadoulet presents a public talk at UC Berkeley on December 17th, 2011, as part of the Science@Cal Lecture Series described at scienceatcal.berkeley.e...

Electric Universe Cosmology: Electric Mythology from the Past

Observations of the Electric Universe fom ancient and modern History Originally posted by SoupDragon42 here: http://www.youtube.com/watch?v=jmXp65Ky3hw&featu...

Science at Cal - Bernard Sadoulet - Shedding Light on the Dark Side of the Universe

The last decade of cosmological observations tells us that 95% of the energy density in the universe is dark: the combination of about 25% of dark matter, wh...

CERN-Dark matter and dark energy

Cosmology and the origin of structure © CERN Lecture 4: Dark matter and dark energy Author(s) Kolb, Edward W ; Treille, Daniel (prod.) (CERN) Affiliation (CE...

175 videos foundNext > 

We're sorry, but there's no news about "Cosmological decade" right now.


Oops, we seem to be having trouble contacting Twitter

Talk About Cosmological decade

You can talk about Cosmological decade with people all over the world in our discussions.

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!