Where did the antimatter go?

It was destroyed after the Big Bang

Antimatter and matter are supposed to be created in comparable abundance. However, almost all matter observed from Earth seems to be made of matter rather than antimatter. Where did the antimatter go? Antimatter was either destroyed within a second after its creation in the Big Bang, or the Big Bang made antimatter in a distant universe that is far beyond our reach and our visible world happens to be in a matter zone. The first possibility could be caused by a possible tiny asymmetry between matter and antimatter, and it is being studied by accelerator experiments. The second possibility is being explored by balloon and space-based experiments – a recent famous one is the AMS-02 experiment mounted on the International Space Station. In those experiments, scientists are looking for tiny fragments of primordial antimatter in cosmic rays.