What is dark matter? Do light-years have anything to do with brightness? What happens in a black hole? Is there other life in the universe? What exactly are planets and moons? And why can't Pluto be considered a planet anymore? Children ask a thousand questions. We adults, on the other hand, often don't dare to ask for clarification. In the extremely complex field of astronomy, most of us have always been completely clueless. It's good that there are the tried-and-true "explain it to me" books. This volume clearly explains the most important topics related to astronomy and the universe, making them understandable for everyone.