They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown. Insisting on perfect safety is for people who don't have the balls to live in the real world. It's a very sobering feeling to be up in space and realize that one's safety factor was determined by the lowest bidder on a government contract. That night there was very little doubt in my mind that the world was headed for grief.
Black holes are where god divides by zero.
The radiation falling on Heaven will heat it to the point where the heat lost by radiation is just equal to the heat received by radiation, i.e., Heaven loses 50 times as much heat as the Earth by radiation.