This is not heavy in math or science per se, but it's a good read.
http://www.intelligentlifemagazine.com/the-music-of-science/the-wonder-of-quasars
http://www.intelligentlifemagazine.com/the-music-of-science/the-wonder-of-quasars
What does it serve to know that they are converting matter to energy at a rate that equates to the complete annihilation of a planet the size of the Earth ten times a second? Or that all the fires of the sun, from its birth to its death, would be a few weeks’ worth of work to one of them? No human sense can be made from so inhuman a scale.