most recent 30 from http://asksci.com 2010-07-29T19:30:04Z http://asksci.com/feeds/tag/universe http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://asksci.com/questions/66/atoms-in-the-observable-universe Jonathan Sampson 2009-10-19T18:24:27Z 2010-02-23T04:23:30Z

<p>It is estimated that there are 10⁸⁰ atoms in the observable Universe. What methods exist to reach this number, and with what degree of accuracy should they be treated?</p>