Wonderful! The descriptions of the accretion disk images are particularly good. Recently for an abstract art project I wrote a simple gravitational lens simula

Wonderful! The descriptions of the accretion disk images are particularly good. Recently for an abstract art project I wrote a simple gravitational lens simulator to distort an image as if there was a 10 Earth mass black hole between the viewer and the objects: http://www.tjradcliffe.com/wp-content/uploads/2015/03/test1.jpg http://www.tjradcliffe.com/wp-content/uploads/2015/03/test1.... It was a quick hack to explore the idea, and I'm pretty sure important details aren't right, but it was good enough for going on with. While doing it I remember thinking, "I wish I had time to explore this whole process properly." Now I don't have to!