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Nov 5, 2017 at 21:43 comment added Henning M. you find an scientific explanation as far as yet understood here. The size of the cracks seems to be material dependent. Sadly, planet/moon-size cooling seems to be more "ridge"-like, like on the moon.
Nov 5, 2017 at 11:50 history answered Ville Niemi CC BY-SA 3.0