What do the commentaries say about other world systems?

Do the commentaries describe life in other world systems? Do humans from other world system look the same? Are they at the same technological age? What about their lifespan? I read somewhere that world systems get destroyed at the same time so maybe other world systems are also at the same stage as we are with comparable technology and lifespan?

I’m not sure where it says this, but the main thing to know is that The Buddha only arises in this world system. Other world systems have different planes of existences. However it would take some research to find exactly where it says this. It is just known by me as common past down from scholars.

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