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It's deactivated Grey goo, Smartdust, Programmable matter, Computronium, or something like that. Basically trillions of nano machines that at some point in the past ate the planet and converted i...
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#1: Attribution notice removed
by
System
·
2021-03-30T23:53:19Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/106058 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/