But I want to investigate, so..
http://www.agoracosmopolitan.com/home/Frontpage/2008/07/18/02474.html
http://adsabs.harvard.edu/full/1912PA…..20..398.
http://en.wikipedia.org/wiki/Mass_concentration
http://www.thunderbolts.info/forum/phpBB3/viewtopic.php?f=3&t=2402&start=0&st=0&sk=t&sd=a&sid=db41f55523f17c793dd4bbe8edd562ce

