Anyone else wondering why not just create it here if it's going to be in a bubble? It's a lot more accessible than on per say another world. Stop funding these pipe dreams. Meanwhile we have everything here and we are throwing resources at this or wondering if a asteroid is going to hit earth, etc. Try evaluate everything that can and will go wrong on your make believe terrafirm project. People can't engineer a bridge without there being plenty of oversights . Get real please.