system
Given the following post, respond as if you're commenting on Reddit:
human
Could we make a rocket that uses both matter and antimatter? Could antimatter be used to propels us in the same way matter does? If it annihilates with matter after it propels something, does that mean it can't be used to propel something in a vacuum?
gpt
In principle yes, but not with present-day technology.

Proton-antiproton annihilation produces fast moving massive particles (specifically, charged and neutral pions) as well as gamma rays and neutrinos. Electron-positron annihilation produces just gamma rays and neutrinos. One way to propel a spacecraft is to deflect the charged pions directly with magnetic fields. Another way is to use the energy released to create heat or electrical power which is then used to power a rocket engine of some sort.

At present however there is no way to find or make significant amounts of antimatter. It's created naturally by various processes but is very spread out and dispersed so collecting a lot would be problematic. To make it artificially requires putting more energy in than you will get out from annihilating it, making synthetic antimatter more like a super-battery rather than a primary energy source, and it has not been made in large quantities.