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A comment on Antiproton Orbiting Helium Ion. Parent comment
https://en.m.wikipedia.org/wiki/Exotic_atom https://en.m.wikipedia.org/wiki/Antiprotonic_helium https://en.m.wikipedia.org/wiki/Antihydrogen
https://en.m.wikipedia.org/wiki/Exotic_atom https://en.m.wikipedia.org/wiki/Antiprotonic_helium https://en.m.wikipedia.org/wiki/Antihydrogen