It accelerates particles super fast and then smashes them into each other and then fancy high precision instruments take a lot of measurements to see what happens. It’s very useful for studying particle behavior and interactions at the sub-atomic level at the near speed of light.
It is credited with finding the Higgs Boson particle (a particle theorized to exist that gives matter it’s mass) and is also helping us understand antimatter.
People freak out because they think it’s going to cause a black hole and destroy earth. It was a bigger fear back in 2008 when people just heard things like smashing atoms together and simulating big bang like reactions.
The only people concerned the collider is dangerous still are the same ones that think eclipses are signs from their specific deity.
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