1. The problem statement, all variables and given/known data Consider the relativity of simultaneity: A student in a train at rest from his point of view and a professor in a train that is moving in the positive x direction from the student’s perspective. Two lightning of different colors will strike at opposite ends of the trains when both trains are in the same position. A red lightning will strike in the left side of the trains and a blue one will strike in the right side of the trains at the same time. Statement A: The student will say that both light waves reached him at the same time while in the professors frame the blue light wave reached him before the red light wave because he is moving towards the blue light relative to the student. Now consider the same situation but from the professors point of view; the student is moving in the negative x direction while the professor is at rest. Explain how statement A is still true. *Obviously all of this motions are non accelerated i.e special relativity 2. Relevant equations Time dilatation Length contraction 3. The attempt at a solution Ive been thinking for several days about this but I cant find out how statement A will still be true. If the student is moving in the proffessors perspective he will see the red light strike first because he is moving towards it. I cant see how this is possible.