Due to being tidally locked, only one side of Mercury ever faces the sun. This side is blasted by perpetual sunlight and is thus a huge desert, filled with lakes of liquid rock. Meanwhile, on the other side, the perpetually-night side is frozen solid, with methane glaciers. But just in the middle, where the day and night side meet, in a land of perpetual twilight, life thrives. It's into this land that explorers are headed in Space 1889, and where you can go with the Mercury sourcebook, available now from Modiphius.
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