Minkowski Diagram

Author:
Allart
Travelling with 0.9c has the advantage of getting somewhere far away a bit faster. Gliese 581-c is located at a distance of 20.25lj. For the explorers on board, the trip will not take 20 years, but "only" 8.83 years. This is due time dilatation. Albert Einstein knows all about this, ask him.