The thing is, and what stops me getting my head round it, is that when you get to near-light speeds everything changes. Time slows down, mass changes, dimensions change, and you can't just add speeds together as you would in a school days arithmetic question.
If you could travel at the speed of light, you would weigh an infinite amount and your physical dimension in the direction of travel would be nil. But you can't go that fast. In theory you could go nearly that fast. Then, in a way, you would be travelling faster than light. The elapsed time as observed by the traveller would be much reduced compared with the time your journey took as recorded by a stationary observer. E.g., you could travel a light year in a few days by your watch, so if you know how many km. you have travelled, you could divide that by the number of seconds gone on your watch and you would have a result much bigger than 300,000. Or you could say that the distance travelled has reduced if you wanted to look at it that way. It's the same thing in this odd world of relativity. apparently (and if I have remembered correctly).
I no more understand this than ancient Greek, but I did read a lot of scifi and popular science books as a youth.
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