Astroparticle physics

Our galaxy - the milky way - consists of matter. 14 million years ago, space, time and matter originated out of a big bang and hence our universe existed. Based upon this big bang theory, the same amount of matter as well as antimatter was produced. A so far unanswered question is, why there has been found no antimatter in the observable universe. The AMS-02 detector is searching antihelium ions. The discovery of antihelium would predict clusters of antimatter somewhere in the universe.

The observable universe represents a mass fraction of 5% of the complete universe. The unobserved part consists of so called dark matter and dark energy. The exact constitution of these components is still unknown.