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Hedgehog ,

Turns out it'd be a dissapointingly small sphere:

US annual defence budget = $800 billion

2% = $16 billion

Obsidian cost per kg = $5

Total kg in budget = 3.2 billion kg

Density of obsidian = 2.6 g/cm3
= 2600 kg/m3

Total volume of sphere = 3.2b/2600 = 1230769 m3

Volume of sphere = 4/3 π r^3

Radius = (3V/4π)^(1/3)
= 66.48 m

The sphere would only stand at 133m tall, I propose we instead utilise the entire defence budget for a much more skyscraper like 490m tall orb

superduperenigma ,

Wouldn't it be better to use all that obsidian to build nether portals so we can build a public transit system on the bedrock roof?

new_guy ,

Now that you mentioned public transportation the US will never agree to the project

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