I mean if you were to measure how quickly the Earth was receding from the spaceship as it accelerates. I'm guessing it's not symmetric to viewing the accelerating spaceship from the Earth, as the Earth remains in the same inertial frame whereas the spaceship is constantly changing its inertial...
Yes, c is an invariant speed. But only in an inertial frame of reference. Not in an accelerating frame. Also, the theory implies that even if you run at c, you will be as far from the speed of light as being at rest. So comparing your speed to c does not tell you if you have reached c. In fact...
Thanks for your reply, JesseM!
I still have some questions to help me clarify this situation. OK, am I right in saying that the coordinate acceleration of the spaceship is the acceleration as observed by someone in an inertial frame outside the ship (as the ship's frame of reference is an...
Hi, I have a question that has been bugging me for ages now. It concerns acceleration up to the speed of light. I know that if an attempt is made to accelerate a spaceship/particle up to the speed of light from the outside, it is not possible to get it to the speed of light because the energy...