###### Asked in AstronomyMath and ArithmeticPlanetary Science

# How old is the universe in seconds?

## Answer

###### Wiki User

###### March 07, 2011 9:15AM

An age of about 13.7 billion years (13.7 x 109 years) is a good estimate for the age of the universe. Set aside the uncertainty and consider that a year has 365 days, a day has 24 hours, an hour has 60 minutes and a minute has 60 seconds and the answer becomes a problem of simple calculation.

13.7 billion years x 365 days = 5.0 trillion days.

5.0 trillion days x 24 hours = 120 trillion hours.

120 trillion hours x 60 minutes = 7.2 quadrillion minutes

7.2 quadrillion minutes x 60 seconds = 432 quadrillion seconds.

Or, roughly 432,329,886,000,000,000 seconds, to 9 significant figures.

**These kind of questions are unanswerable, and all answers
become futile and inconsequent. Dimension or idea of time and space
are separated from life and non-living things.**

**Firstly, the big bang theory is exactly this : a theory, at
least at this moment.**

**It is the same thing as to ask : When the Universe shall
disappear ? To set an estimated time is necessary to set a
beginning. Therefore, it is impossible to give any kind of
estimating age for anything that you don't know how and when it
started.**

Just a comment on the mathematics: If you are going to give the
answer to 9 significant figures, then the number of days in a year
ought to be to more than three significant figures. For example
365.25 would be slightly more accurate. But given the age is
estimated it doesn't seem worth going to too many significant
figures anyway. Having done my own calculations (based on a figure
of 13.75 billion years) I came to an answer of **434 million
billion seconds**. When I searched answers.com to check my
calculations I was pleased to find the answer quoted above is
nearly the same.