Planetary neighbors
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Let's say there is another planet in our solar system that harbours sentient life and this sentient life can build castles, buildings, and other such structures.
When would we notice that?
We can see the planet but we can't see lifeforms through basic telescopes - they're not close enough.
They don't have technology to send signals - we end up finding them.
This post was sourced from https://worldbuilding.stackexchange.com/q/153380. It is licensed under CC BY-SA 4.0.
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