Among the most unimaginable: "Two black holes most massive ever found, astronomers say"
Check that event horizon. Beyond human imagination.
http://lightyears.blogs.cnn.com/2011/12/05/two-black-holes-most-massive-ever-found-astronomers-say/?hpt=hp_c2
"The mass of each is about 10 billion times the mass of our sun. The previous black hole record holder, first measured in 1977, has a mass of about 6 billion suns.
"And for each black hole, the "event horizon" – basically areas from which nothing can escape their gravity – is about five times the distance between our sun and Pluto."