The trip becomes quicker (to you) the faster you go. If you could ride a beam of light, you’d be there instantaneously, thanks to length contraction. Meanwhil

The trip becomes quicker (to you) the faster you go. If you could ride a beam of light, you’d be there instantaneously, thanks to length contraction. Meanwhile 4 years would pass on earth in some sense. (To an observer watching from earth with a hypothetical telescope, you are seen to arrive only after eight years total. Of course you could just ride the light back and tell him about it all, ha.)