We all know that the state of matter can be changed by increasing temperature or by applying pressure. And, all of these, in some way lead to a change in the particles' speed. The speed of the particle decides the state of matter. So, if we were to throw an object at very high speeds, like 50% of the speed of light, the particles' speed will also increase, as they are a part of the solid. This means that, as we reach higher speeds, the state of matter should change, because the speed of particles has changed. We can also say that it will never be possible for a large solid to attain light-like speeds (Also, solids don't move, they vibrate. But, liquids and gases move. So, this question can probably change to liquid-gas condition, rather than a solid-liquid-gas condition). Can this happen in the real world? If not, please state why. And I am sorry if I made any silly mistakes, I don't know a lot about physics.