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In our part of the universe, antimatter absolutely exists. We use it all the time for medical imaging. For instance, the "PET" in PET scan stands for Positron (an antimatter particle) Emission Tomography. However, it is not plentiful by any means and it is very short-lived...

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Q: In our part of the universe antimatter is plentiful short-lived long-lived non existent?
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