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submitted 2 months ago by [email protected] to c/[email protected]

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[–] [email protected] 35 points 2 months ago (3 children)

This sounds like a job for https://what-if.xkcd.com/

Is there enough obsidian on this planet? Would its weight crush the earth's crust? How would we construct it?

[–] [email protected] 28 points 2 months ago

Constructing it is easy, just get a couple hundredthousand buckets of water and lava and bob's your uncle

[–] [email protected] 23 points 2 months ago* (last edited 2 months ago)

Well, the chapter 54: Snowball in Randall's book What If? 2 contains the following, semi-related graphic:

(Maximum diameters of spheres of various materials before collapsing under their weight, which is about the same as the material's free-hanging length)

[–] [email protected] 9 points 2 months ago

I think the answers are yes, somewhat (in addition to collapsing under its own weight), and probably impossible.