He knew that there had been trouble, and he had been told what he had to do. The trouble was he had forgotten. He didn't remember where it was. He had been speeding past an off-color white dwarf when it happened. If he had taken the trouble to look around, he would have seen that the white star was going to explode. He knew a potential nova when he took a good look at one. But after all these centuries he had grown careless, and when the blast had come—the small star suddenly blazing into a bill