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Oct 24, 2017 at 22:13 vote accept Slarty
Sep 20, 2017 at 17:47 answer added A.G. Weyland timeline score: 3
Sep 16, 2017 at 17:18 answer added Willk timeline score: 7
Sep 16, 2017 at 15:03 comment added SFWriter Grand Canyon? I am not certain that what you describe has been observed in our solar system, and from that perspective it seems a natural explanation may be hard to find. Perhaps a cataclysmic even like a large asteroid strike could form an enormous feature on the scale you describe, but it would erode and not meet your criteria. Perhaps the features are constructed by ancient races. I wonder if you could solve some problems by introducing other elements - The walls are unscalable due to a type of hypothetical (toxic) plant that grows on vertical surfaces, for example, rather than geometry.
Sep 16, 2017 at 14:49 history asked Slarty CC BY-SA 3.0