Hi. Although this is a rather non-sensicle question, I believe it is one that Einstein posed to his teacher when he was at school: What would the earth look like to someone who had 'hitched a lift' towards the earth on the back of a photon? In the frame of reference of the light traveller, would it not be true that time would dilate infinitely, so he could never age? And would he be able to observe the quickly approaching earth? Thank you for any replies.