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
