We know that with very low mass even light-speed velocity is not enough to cause any damage.
Which particles with mass can travel through air at the speed of light at the earth's surface?
When I say "light-speed" and talk about our bodies being bombarded by billions of light-speed particles per second, I am rather obviously (to most people) talking about the impact speed of those particles, whether they are passing through the atmosphere, water, glass or whatever. Those particles have mass.
In a perfect vacuum (a massless and therefore gravityless environment) than exists even in outer space, the theoretical maximum speed of light is a bit higher than through earth's atmosphere but the particles must be without mass (and therefore without energy) to achieve it.
There is a maximum theoretical speed for light but there are many actual light speeds, depending on the mediums through which the light is passing. Pick one.
