35K views · 304 reactions | Physicists talk about a measurement called luminosity when they talk about particle collisions. Luminosity measures how tightly packed the particles are in the beams that cross. The tighter the squeeze, the more likely it is that some of the particles will collide. Learn more: https://www.symmetrymagazine.org/article/what-is-luminosity | Fermi National Accelerator Laboratory | Facebook