Antimatter particles could cross the galaxy without being destroyed

Dark energy and antimatter in space

Dark matter could produce antimatter with high enough energies to cross the galaxy


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 …

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