My napkin math is that a bubble with a shadow the size of Brazil and made out of graphene weighing 0.77 mg per square meter would weigh about 25 million kg. Using multiple smaller bubbles could reduce this by at most a factor of four.
At a cost of $1,000-$10,000 per kg it seems possible to get this to space with a total cost on the order of hundreds of billions of dollars.
You could do a estimate of the graphene itself but I think the cost would be similar.
At a cost of $1,000-$10,000 per kg it seems possible to get this to space with a total cost on the order of hundreds of billions of dollars.
You could do a estimate of the graphene itself but I think the cost would be similar.