Why hasn't anyone found any antimatter larger than antiparticles?

   If all matter exists in an antimatter state, then it's curious why so little antimatter has been seen. We have detected the antiforms of subatomic particles, but where is the bigger matter? In theory, particles and antiparticles are always created in equal amounts, or destroyed in equal numbers in explosions of energy and gamma rays. This balance between matter and antimatter is known as symmetry. One possible reason is that matter and antimatter do not exist in equal amounts. There may be far more matter, dwarfing antimatter in comparison. And maybe matter has already destroyed most antimatter. Another theory is that matter and antimatter occupy separate spaces. Perhaps our universe has an anti-universe twin, and the two are somehow kept apart.

electron and positron