• @Hedgehog@lemmy.blahaj.zone
    link
    fedilink
    106
    edit-2
    7 months ago

    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

    • Margot Robbie
      link
      fedilink
      717 months ago

      Nobody said it had to be a solid sphere, how else would you get it to emit the ominous hum without attuning its natural frequency by carefully designing the thickness of the obsidian layer?

    • @lseif@sopuli.xyz
      link
      fedilink
      647 months ago

      ignores engineering and construction cost. but we can assume that all people involved would work for free, because its a massive honour

    • @pokemaster787@ani.social
      link
      fedilink
      407 months ago

      Well that’s assuming it’s completely solid and not hollow. Hollow would probably be pretty huge, although the structural rigidity might not be great. Maybe we make a giant obsidian 3D printer and print it at like 10-15% infill.

    • @TheKracken@lemmy.world
      link
      fedilink
      147 months ago

      You’re assuming one year of budget. I take it as 2% per year and something of that size would likely take 10+ years to build out.