Make that visible universe. On Thu, Apr 23, 2009 at 6:13 PM, Roger Hui <[email protected]> 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 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
