I'm thinking, Just supposing the universe was going to end in 200 million years and you could travel at the speed of light. (If you travel at the speed of light time stops for you relative to the rest of the universe). Anyway just supposing you decide to travel at the speed of light for 201 million years. As soon as you start ,time stops but before you get to where you're going the universe has ended so you no longer exist the very moment you start your journey. But just supposing you decide to travel at the speed of light for 190 million years. Time stops immediately when you start your journey but when you're finished there is still 10 million years to go before the end of the universe. The thing is, in both journeys time stops the moment you start the journey so does the outcome depend on what you intended doing or what you actually did?