Well keep in mind here that antimatter is ridiculously energy-intensive to create, at least with current technology, so there’s no feasible way to make kilos and kilos of it. A recent experiment at CERN managed to create [groups of about 100 anti-hydrogen atoms.](https://home.cern/news/press-release/physics/alpha-experiment-cern-observes-influence-gravity-antimatter) 100 atoms is like, nothing, practically. It’s an incredibly small amount of hydrogen and yet it is extremely impressive that they are doing this because it involves creating anti-protons and positrons separately and then combining them. So that’s the scale we’re working with
But that being said the experiment used a “magnetic trap” to keep the anti-hydrogen atoms in place. The atoms have a slight magnetic charge so you can use a powerful magnetic field to hold them suspended in space so they don’t hit any matter and annihilate. And then, in this experiment, they just let them out. They just let go of them and let them annihilate because again, this is an incredibly small amount of antimatter
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