Where do antimatter matter particles exist?
While there is an antiparticle for every particle no one knows why the universe is almost completely matter with very little antimatter. It is one of the unsolved mysteries in physics as at the beginning there is no reason to favor matter over antimatter. So to your question they mostly do not exist anywhere. They are created in high energy collisions (either naturally or in a lab) but almost always annihilate with matter shortly after so it does not hang around long. Some scientists have some in labs sealed in magnetic bottles (the antimatter cannot be kept in any other container as it would annihilate on contact with the normal matter of the container). Despite being able to create it in atom smashers antimatter is very rare and technically the most expensive substance on the planet (around $62.5 trillion per gram…yes, trillion).
