44K views · 220 reactions | Comparison of speed of light  The speed...

We are often taught that nothing can travel faster than the speed of light. This is true in a vacuum (like space). The universal speed limit, c, is unbreakable. But in a material like water, light actually slows down. In water, light travels at about 75% of its vacuum speed. This creates a loophole for high-energy particles. In nuclear reactors, subatomic particles (like electrons) are often ejected at speeds that are incredibly fast—faster than the speed of light *in water* (though still slower