MaxE wrote:
It's generally understood that one can reach quite high speeds rather quickly if able to accelerate continuously. In The Expanse there's a generation ship built by Mormons that IIRC is expected to reach Alpha Centauri in much less than 19k years, although I don't recall exactly how much time they foresee. The reason for this is the hypothetical Epstein Drive that allows for that sort of constant acceleration (as well as "artificial gravity").
However, the big problem with this is that there are bigger impediments to achieving high speed than just the Speed of Light. It's my understanding that if you approach even one tenth the speed of light, the impact of even the most microscopic dust particle would be enough to blow your vessel apart. So mankind will probably not even come close to being limited by the speed of light.
Technically, yes. But if there was some way to convert matter to energy before travelling that fast, would it matter if it gets blown apart, if there is a way to put it back together?
Also this could be a very minor problem with technology that repels particles. If a being is able to travel that fast, repelling particles is likely childs play.