Today’s astronomers are no longer the loners they once were. Nowadays they are linked into a vast international network, exchanging information with physicists, chemists, and biologists. Such collaboration brings them closer and closer to answering the question of how the Universe began and to understanding the origins and future of our own blue planet. You, too, can help astronomers by getting involved in one of the „citizen science” projects, aiding scientists in unlocking the secrets of the Universe.