http://www.skyandtelescope.com/astronomy-news/weighing-a-supermassive-black-hole-06251534/
Jun 25, 2015 #1 TomTerrific Well-Known Member Rating - 0% 0 0 0 Jul 11, 2010 4,061 38 Centre, Ky http://www.skyandtelescope.com/astronomy-news/weighing-a-supermassive-black-hole-06251534/