Scientists around the world study cosmic particles that reach us from the most distant places in the universe in order to decipher their messages from space. But what are cosmic particles? Where do they come from and what can we learn from them? What can they tell us about their sources, acceleration processes and the composition of the universe? What is astroparticle physics and how does it relate to astronomy and particle physics? This video gives you a first impression of the exciting topic of astroparticle physics!