The Nobel Prize for Physics this year has been awarded to three researchers who showed that the universe is expanding at an increasing pace. Physicists don't yet know how this could be happening; they've had to dream up a massive amount of hypothetical invisible matter to get their equations right.
As a boy, I was pretty interested in astronomy. I remember reading about quasars that were 10 billion light years away and thinking, "Well, why should quasars only be found at the fringes of the universe? What's so special about the edge, except that the light reaching us from there is coming from the farthest back in time? If a chap stood on one of those quasars and looked toward us right this second, maybe he'd see a quasar too. Maybe, the universe was full of quasars ten billion years ago."
Well, apparently it was, more or less.
Before I got to the quasars bit, I learned the universe was expanding. I wasn't a morose type as a kid. The knowledge that the universe was expanding, and the stars and planets would probably keep drifting farther apart and grow ever colder till all communication and all life ceased, was about the only thing that depressed me around the age of ten. When I saw Annie Hall years later, I realised Alvy Singer had felt the same way back during World War II.
Unlike Alvy, though, I stopped doing homework a while before I read about the Big Bang theory.