A theologian and an astronomer were talking together one day. The astronomer said that after reading widely in the field of religion, he had concluded that all religion could be summed up in a single phrase. "Do unto others as you would have them do unto you," he said, with a bit of smugness, knowing that his field is so much more complex. After a brief pause, the theologian replied that, after reading widely in the area of astronomy, he had concluded that all of it could be summed up in a single phrase also. "Oh, and what is that?" the astronaut inquired. "Twinkle, twinkle, little star; how I wonder what you are!"