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Sun in a fixed position in the sky, impassible ice and desert barriers on all 'sides'. These planets must be full of flat 'earthers'.

Two of their most memorable technological milestones might be:

1. First crossing of the hot side, passing through the point where "sun" is directly overhead. (Having the sun directly overhead would probably seem very profound and unusual to them.)

2. First crossing of the cold side, passing through the opposite point.

Both would have unique challenges. Crossing the hot side would require an amazing ability to keep cool. You can keep warm by burning stuff and using lots of insulation, but how do you do the opposite?

Crossing the cold side would have temperature challenges and also very difficult navigation because of the continuous darkness. Maybe there would be moon(s) and stars for some light, though.

In both cases, I wouldn't be surprised if the first crossing had to wait until the invention of the airplane. You definitely aren't doing it by sea the first time like we did here on Earth.

IIRC from various articles, there might also be hefty storms around the terminator where the thermal difference between hot and cold plays out...

THIS planet is full of flat earthers. :)

It was anyway. Now they're a blessedly rare species.

Flat Earthers are an elaborate hoax ;)

On the other hand, it'd be far more straightforward to circumnavigate a planet like this since there's only one dimension in which you can travel!

Reminds me a lot of the world of One Piece manga

And cylinder 'earthers'!

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