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Originally Posted by Andreas
I didn't mean matter moving. I was talking about the slow speed of light, the light we see, distorting the view of an explosion type expansion and making it distinguishable from an expansion of space. So far I didn't handle light cones and whatever to determine how exactly it would distort it. It only works so good on paper if light was infinitely fast.
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One time I tried to think of what the universe might look like if we could see it from the outside, and if it is an expanding sphere, but then I realized the limited light-speed problem that you are talking about. That’s a big problem when we are dealing with great distances and a big universe. We certainly do see a time-lag distortion.