I always had a question about relativity. Suppose an astronaut in orbit Saturn just must reach earth fast as possible.
Your ship can travel at any speed between 0 and the speed of light. the distance is 60 minutes in lightspeed. But if he travels near the 0.99c there will be an expansion of 8x time, which will make the travel last 8 hours.
If he travels at light speed, it will take all eternity to reach earth, so, he will "never" reach.. If he travels at 0c he will never reach either...
So, what is the best speed to get to the earth fast as possible?