I think that's an underestimate, the speed of light is constant but it was much faster when the big bang just started if there was one (obviously not verified).
On Thu, 23 Apr 2009, Roger Hui wrote: > The radius of the universe in meters is: > 15e9 years * 365.2425 days/year * 24 hours/day * > 3600 seconds/hour * 3e8 meters/second > > ] r=: */ 15e9 365.2425 3600 24 3e8 > 1.42006e26 > > Its volume in cubic meters is: > o. 4r3 * r^3 > 1.19953e79 > > The minimum size of an atom is a Bohr radius sphere: > o. 4r3 * 5.3e_11 ^ 3 > 6.23615e_31 > > The number of atoms is therefore bounded by the > former divided by the latter: > (o. 4r3 * r^3) % (o. 4r3 * 5.3e_11^3) > 1.92351e109 > > That is, if the entire universe is packed with atoms, > there'd be no more than 2e109 of them. > > > > ----- Original Message ----- > From: [email protected] > Date: Thursday, April 23, 2009 13:59 > Subject: Re: [Jprogramming] table of primes to 1,000,000,000 or more > To: Programming forum <[email protected]> > > > I believe the estimate of 10^100 atoms is actually hydrogen > > atoms. > > > > Anyhow, I got my estimate from wikipedia.com. > > > > > > ----- Original Message Follows ----- > > From: Zsbán Ambrus <[email protected]> > > To: Programming forum <[email protected]> > > Subject: Re: [Jprogramming] table of primes to 1,000,000,000 > > or more > > Date: Sun, 19 Apr 2009 11:29:10 +0200 > > > > >On Sat, Apr 18, 2009 at 10:10 PM, > > >> <[email protected]> wrote: If there are ~ > > >10^100 atoms in the universe, > > > > > >I think that's an underestimate, there are actually between > > >10^200 and 10^300 atoms in the universe I believe. > > > > > >Ambrus > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 唐詩015 王維 青谿 言入黃花川 每逐青谿水 隨山將萬轉 趣途無百里 聲喧亂石中 色靜深松裡 漾漾汎菱荇 澄澄映葭葦 我心素已閒 清川澹如此 請留盤石上 垂釣將已矣 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
