Did you know that the universe is expanding even as you read this? That stargazing is really looking back in time millions of years, and that sound cannot travel in space, so you can be as noisy as you like? With witty pen-and-ink illustrations, mazes, puzzles, and games, this activity book engages readers of all ages on every page with fun facts about the amazing realm beyond Earth's atmosphere. Readers learn to calculate their age in Jupiter years, draw their own solar systems, and navigate out of a black-hole maze, while discovering more about planets, stars, comets, asteroids, and other celestial objects.