Pi and the size of the Universe - Numberphile

Pi is famously calculated to trillions of digits - but Dr James Grime says 39 is probably enough. All our Pi videos: http://bit.ly/W4oDN1

An extra note from Dr Grime: "Since pi39 ends in 0, you may think we could use pi38 instead - which has even fewer digits. Unfortunately, the rounding errors of pi38 are ten times larger than the rounding errors of pi39 - more than a hyrdogen atom. So that extra decimal place makes a difference, even if it's 0."

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Videos by Brady Haran

• Category

  Science & Technology

[Shmifflepuff]

Well its smaller than 4...

[MEGABOY240]

LOL

[blindaim]

Because the universe itself is expanding, at an accelerating rate.

[IceMetalPunk]

I don't understand that number for the diameter of the universe. If it's the diameter at which light has traveled out from the Big Bang, and the Big Bang happened about 13.8 billion years ago, wouldn't that be a radius of 13.8 billion lightyears? So a diameter of 27.6 lightyears? That's only 2.61110584 × 10^17 meters...that's much less than 8.8x10^26 meters....what's going on there?

[E1craZ4life]

And tau's that?

[Micic00]

How so? Pi is way cooler.

[Micic00]

Why would that matter? You can write any number indefinitely and it will at one point be as big as universe if you could write it at the speed of light. So I think you're asking wrong questions.

[ohyea354]

Congratulations you are the winner...the correct answer is time....1440 minutes in a day which adds up to "9"...the mysterious "9" aka the hidden God....the hidden force. Here is your price (3 links, lol...better than nothing right)

/watch?v=-Rrsm4aMUgE

/watch?v=Mn51BgDcCkI

/watch?v=uaPChr2NyBE

The number "9" is a unique number because it is existent and non existent at the same time. 9 which makes up time and space, its everywhere and nowhere at the same time, enjoy the links and respect ;)

[Kamineru73]

Tau is cooler

[Chad Sargent]

Time

[John W. Nicholson]

Ok, diameter of H, but not Up or Down quarks.

[ohyea354]

Whoever solves this riddle is a genius:

You are trapped in 1440. You cannot escape it. It's always present. You heard of it before but no one quiet knows what it is. The sentence that came before this one might be there to throw you off even though its the truth. What am i refering to?

Whoever solves this riddle is a genius. It's a one word answer.