Antimatter isn’t just made of antiparticles, it’s also made of waves. Now we know that this holds true even at the level of a single antimatter particle.
Physicists have known for a long time that just about everything — light and other forms of energy, but also every atom in your body — exists as both particles and waves, a concept known as particle-wave duality. That’s been shown again and again in experiments. But antimatter particles, which are identical to their matter partners, except for their opposite charge and spin, are much more difficult to experiment with. These twins of matter flit into existence fleetingly, usually in massive particle accelerators.
But now, physicists have shown at the level of a single positron — an antimatter twin of the electron — that antimatter, too, is made of both particles and waves.