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C.

thought of the day: "I wonder what the total mass of an Arthur C. Clarke-type space artefact made of solid osmium would be?" [1]

So, take a cylinder - rotating, natch, you want to use it for time travel or other violations, why else would you have one? - say, 1000m in diameter, and pi times as long (why not?)...

If I've done the math right, the answer is approximately 55.74 billion tonnes.

sated.

[1] is the densest natural element, at a little over 22.5g / cm^2, vs. 1g/cm^2 for , or 7.8g/cm^2 for .