1. Traveling at 90% the speed of light by what factor does the traceler's time dilate in comparison to their family on earth?
If this question is a little confusing, try plugging in some numbers.
Example: If you traveled 80% the speed of light for 10 minutes, how much time passed for someone who is standing still.
2. Traveling at 80% the speed of light to Gilese 581's planet, it would take us about 96 years to reach the planet. How much time would have elapsed on Earth?
3. If you traveled at 90% the speed of light for 15 year round trip, how much time would have passed on earth? What would happen to your family?