# What would happen to perceived time in this scenario?

This is difficult for me to explain, but hopefully I can get my question across...

Let's say there is a planet called Planet X one million light years from Earth (there probably is). Let's also say there is a craft named Speedy 1, which could travel at the speed of light. If we hopped into Speedy 1 and travelled toward Planet X, we would arrive in one million years. If we could view Planet X from Earth, we would be seeing events from one million years ago. (Please stop me here if I'm wrong by the way.)

But traveling in Speedy 1 as a passenger, you are shortening the time delay between Planet X and yourself. You are now witnessing events from a variable-amount-of-time ago. Does anyone know how this would look to the passenger? While traveling, would we witness events unfolding at a faster rate than they actually are happening?

• "..which could travel at the speed of light." According to relativity, nothing but light (and fields) can travel at the speed of light. The relativistic formulas go to 0 (e.g. length) or infinity (e.g. mass and time) at the speed of light.. – Andrew Thompson Jul 27 '15 at 7:55
• Sorry, my understanding was that nothing could travel faster than light. In that case, doesn't the question still have merit? – Ricky Jul 27 '15 at 8:21
• The Lorentz factor is significant here. Note that at .99C it is 7.09, at .999C it is 22.37, at .9999C it is 70.71, at .99999C it is 223.61.. At C it is infinity. So as you can (hopefully) see, the 'infinity' figure is what makes it impossible for any matter to reach the speed of light, and minor variations in speed just before that have an enormous difference. "In that case, doesn't the question still have merit?" I am unable to comment on whether the question has merit, but it makes no sense .. – Andrew Thompson Jul 27 '15 at 8:46
• .. to be talking about a ship travelling at a speed that it cannot ever reach. For any speed before that, it is necessary to pin it down precisely in order to get a number. – Andrew Thompson Jul 27 '15 at 8:47