Question about particles near the speed of light

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The Large Hadron Collider (LHC) accelerates particles to 99.9% the speed of light using extremely strong magnets to maintain their trajectory. As particles approach light speed, they theoretically attain infinite mass, which raises questions about how they are contained within the accelerator. The LHC features a circular path with a diameter of 2 kilometers, designed to accommodate the gentle radius of curvature necessary for effective particle confinement.

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The LHC is acccelerating particles to 99.9% the speed of light, but don't objects approaching the speed of light theoretically also attain infinite mass? So my question is, how would the accelerator keep those particles "roped in"?
 
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Very strong magnets. :smile:

Also a gentle radius of curvature. The LHC's circular path is 2 km in diameter.
 

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