Things would have been interesting if, when we peered out into the universe with telescopes and more powerful instruments, we saw glaring signs of extraterrestrial intelligent life, civilizations with far more capability than our own, perhaps astroengineering. But we don't, unless we've missed the obvious.
The cosmological principle predicts an "End of Greatness" at large scales. Imagine mapping superclusters of galaxies to discover a large void shaped like a perfect cube cut out of the universe.
There are as yet unexplained deviations from the cosmological principle, e.g., large quasar groups.
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