Relativity(Light years)??? PLEASE HELP! 1. The problem statement, all variables and given/known data Imagine an astronaut on a trip to Siris, which is 8 light years from Earth. On arrival at Siris, the astronaut finds that the trip lasted 6 years. If the trip was made at a constant speed of .8c, how can the 8 light year distance be reconciled with the 6 year duration? 2. Relevant equations E=mc^2 3. The attempt at a solution I don't know how to solve this question....8 light years-> 6 years. 3/.8c?? Please help!