http://www.slate.com/blogs/bad_astronomy/2015/02/09/cosmic_smiley_a_happy_gravitational_lens.html
Feb 9, 2015 #1 TomTerrific Well-Known Member Rating - 0% 0 0 0 Jul 11, 2010 4,061 38 Centre, Ky http://www.slate.com/blogs/bad_astronomy/2015/02/09/cosmic_smiley_a_happy_gravitational_lens.html