Theres the classic experiment in which someone is sent into space, rides around at a high speed, and comes back to everyone being older. Im assuming the reasons for this are well understood by the forum community. But what if the people on earth were to build a device capable of tracking the spacemans craft, and sending a video/audio signal to him. How would they appear? would they seem to be moving in a "fast forward" sort of motion, or would they jump ahead as the spaceman decellerated? I have a vague grasp of this, but im looking for some more definite understanding. Also, for the purposes of eliminating variables, the spaceman is moving at about 99.9% of c