[PSUBS-MAILIST] concrete

[hank pronk]

A cheap alternative to a super strong sphere hull is re-enforced concrete. I feel like hiding under a blanket while I say this,lol.  I know it is way out there, but concrete is super strong under compression.  It is not so good for impact resistance.  Concrete is a very easy material to work with and form into a sphere shape.  I have no idea what thickness would be needed.  Properly engineered I would trust it. 
Hank