Nuclear reactor + tons of time + very small space capsule
If there is no friction in the vacuum of space why wouldn't a rocket continuously burning simply keep going faster, and faster, and faster...
It doesn't matter how fast you accelerate or for how long you will never move faster than light. When you decide to stop accelerating you will notice that light is still moving away form you at the speed of light. And that you are still moving below the speed of light when compared to your starting frame of reference.
