Dark matter could produce antimatter with high enough energies to cross the galaxy
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Antimatter from far away should be tricky to find. It annihilates when it meets regular matter – and the more space it crosses, the more chances there are for these particles to meet their end. But an experiment at a particle collider suggests that some antimatter particles can travel across our galaxy without getting destroyed.
In space, the antimatter version of helium atoms’ nuclei – the antihelium nuclei – are thought to form when cosmic rays collide with …
