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Imagine a line of stakes 1m apart. The line is so long you can't see the end - and maybe there is no end.
Go away and come back, and...
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Wright's tutorial pages list issues with tired light. https://www.astro.ucla.edu/~wright/tiredlit.htm
It's good to keep those in mind as...
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Imagine a line of stakes 1m apart. The line is so long you can't see the end - and maybe there is no end. Go away and come back, and...