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There are many wealthy nations and nations growing in wealth who
could, among them, contribute mightily to a shared exploration of
space.

Europe. Japan, China, India. Brazil. To name a few.

It will take diplomacy to get these folks on board.

Or, alternatively, we could do what they do in the old Allen Steele,
which is create a private corporation capitalized from people around the
world interested in exploiting space for profit.