1. The problem statement, all variables and given/known data Two space craft are flying towards a planet at 0.9c and 0.3c relative to the planet, respectively. If they fire their laser beams simultaneously from a range of 109 m, which will strike the planet first and what will be the delay before the other beam strikes? 2. Relevant equations 3. The attempt at a solution Einstiens 2nd postulate: The speed of light in a vaccum is completely independent of the motion of the source emitting it. From that it seemed to me that the laser's would hit the planet at the same time......then I started considering length contraction, if the 109m was measured from the planet then there "actual" distances would be different resulting in a delay. Admittedly I have a terrible grasp of this topic so this could be complete bs. The question wording I think is pretty bad (could just be me) so I need someone with a better understanding to read it and give me a clue about considering length contraction (necessary or not??). thanks for any help!