**Antimatter: We cracked how gravity affects it. What it means for our understanding of the universe**

A substance called antimatter is at the heart of one of the greatest mysteries of the universe. We know that every particle has an antimatter companion that is virtually identical to itself, but with the opposite charge. When a particle and its antiparticle meet, they annihilate each other—disappearing in a burst of light.

https://phys.org/news/2023-09-antimatter-gravity-affects-universe.html