by Mike Krumboltz Today's fun fact: The universe is big. Like, really big. And because it's so darn big, a lot of cool stuff is bound to happen inside it, right? Right! This past week, astronomers made a wild new discovery concerning Halley's comet , folks prepared to see another planet up close, and the possibilities of space tourism took off. Below, a roundup of those stories and more. Prepare for lift off " it's the Buzz Week in Review.