When we look at the night sky, we see the stars in the past - the further the star, the further into the past it is. As everything is moving about, many of our favorite stars have probably moved vast distances, since emitting the light we now see. Has anyone ever made a map of where everything is right now?

Me and my twin develop a rocket that can fly through space near the speed of light... He gets in and takes off and his rocket approaches C. From my perspective time slows down for him, he ages slower than me on earth, and when he returns more time has passed for me.  But from his perspective earth has taken off at near C away from him, so shouldn't he see time slow for me.  And from his perspective, when earth returns shouldn't he have aged more rapidly than me? If its all relative, what is the mechanism that decides who ages, when both brothers see the exact same scenario from different points of view?

I have asked this question time and time again and never found a definitive answer to it.

Lets say we want to travel 60 miles and we travel at 60 miles an hour, we get there in an hour. Now by my thinking if we travel at 120 miles an hour, we get there in half an hour.

So if we then travel at 240 miles an hour, do we get there instantaneously? Please someone put me straight on this because it has been nagging my noggin for aeons!

James