Alright, so I am going to try to structure this question as carefully as possible, since it has a lot of parts, but I may have to clarify more later. Anyway, first off, which of these scenarios (if any) is correct: The crew of a spaceship moving at near C to a planet 5 light years away observes the trip there and back as just slightly over 10 years long (excluding time it takes to accelerate, or turn around, etc.), and observers from Earth see this trip as taking longer. The crew of the spaceship sees the journey as nearly instantaneous, while observers from Earth see the trip as taking 10 years, though the people inside would appear to be moving VERY slowly. Now, if the first scenario is correct, then that means that the spaceship would appear to be moving at LESS than the speed of light to Earth, which would also mean that at some point, along the path from 0 to light speed, accelerating would, to an observer, make you move slower, or that there is a speed at which rather than accelerating forward, you appear to maintain the same speed, but slow down within the ship more and more. So, again, which would it be? If the SECOND scenario is correct, then moving at the speed of light, as observed by Earth, makes observers from inside the ship see themselves moving at much faster than light (hence traveling 10 light years in less than 10 years). If THIS is the case, then there has to be a point at which those on the spaceship would see themselves as moving at the speed of light. If so, what would this speed be to an Earth observer? Yes, a lot of... almost rambling there, but these things are really bothering me tonight. Please make me feel like I understand relativity again.