two science-fictional universes:
speed of light is infinite. fun with world building: invent completely different theories of electromagnetism, special relativity, and gravity.
speed of light is finite but a number too large to comprehend, similar to Graham's number. how was it discovered to be finite? this scenario could happen in our universe with slow intelligent life.
in both, high speed interstellar travel is possible without breaking special relativity, as is instantaneous or nearly instantaneous communication between distant worlds.
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