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Q&A In what era or tech level in earth's history did people have the ability to cross a super-earth's ocean 50,000 km wide?

I have a huge planet with two continents separated by a wide ocean. Inhabitants think that their continent is the whole world because the other side is too far and they never visited it. What if pe...

16 answers  ·  posted 6y ago by brendt‭  ·  last activity 6y ago by brendt‭

Question earth-like reality-check planets civilization earth