An alien world with medieval level technology and some sort of mechanism or mode of space travel

The title says it all. How would one go about creating a planet with aliens that have medieval grade technology (windmills and carts and stuff.) No high level technology. However, I want the aliens to be capable of space travel. I feel like a portal of some sort might work but I really don't want anything magical; all science please.. Thanks :)

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An alien world with medieval level technology and some sort of mechanism or mode of space travel

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