system
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human
Does matter with negative mass move faster than light?

So from what I know, light moves so fast because it has no mass, and everything else moves slower because it has at least some mass. I've heard that theoretically it is possible for matter to somehow have negative mass. So if that is the case, would that matter move faster than the speed of light?
gpt
If you had an object with negative mass, it would not move faster than light, but it would accelerate opposite the direction in which it was pushed.

An object with *imaginary mass* (in the technical mathematical sense of "imaginary," namely that its square is a negative number) would move faster than the speed of light.  Such a particle is called a tachyon.  It can never move slower than the speed of light.  The less energy it has, the faster it travels; the more energy it has, the closer it gets to moving at the speed of light.

Needless to say, there is currently no evidence for either negative or imaginary mass.