As an Anarchist if we were an anarchistic society anyone could fund any project they supported including NASA. Yet those that do not wish to fund it would not have to. Basically it becomes a crowd sourcing movement. It may not be NASA that I fund as there could be legitimate competition at that point. I would offer some funding from my own funds to whomever I felt was doing the most efficient and focused job of getting us into space. So I would fund space exploration with my meager funds. This could be NASA or it might be someone else. Competition is key.