4 ms·

Would high helium prices prevent this nowadays?

• femto 12y ago
  My first thought was why not just evacuate it, given that it's a vacuum vessel? It doesn't work though. Making some gross assumptions about its dimensions, its buoyancy when empty would be the weight of a few tons. Not enough to lift itself!
• ars 12y ago
  You'd have to use hydrogen. It's more dangerous of course, but it should be doable.