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But, then I always wonder, what happens when it comes back. I'm really unsure of how to describe the maths of this, but wouldn't it look faster coming back, somewhat like the doppler effect. It seems symmetric, if total ship time for ship occupant's is 2 years, and it seemed like it took 1.1 to go out, it seems like it would - from the observers point of view - that it would take 0.9 to come back.

What am I missing?