It smashes hadrons (composite particles like protons and neutrons, electrons are elementary and have no smaller parts) together to see what comes out. This can create new particles we’ve never seen before and it furthers our understanding of physics. The ATLAS detector detected the highs boson a decade ago and changed how we understood the concept of “mass”, and what causes it.
Why people are afraid is because a machine like this can possibly create micro black holes. They hear this and freak out, but even if it did they would be small, and the smaller they are the quicker they evaporate, which they would do almost instantly. There is no danger
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