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Several ex-NASA officials are behind a company that plans to offer trips by 2020.
Reduced government funding could scuttle some projects.
A successful launch moves commercial space companies toward human spaceflight.
The supply of new spacecraft, launchers, and spaceports could soon exceed the demand.
Such a rocket would dramatically reduce the costs of spaceflight—a promise NASA’s space shuttle failed to deliver on.
Firms look to provide automated landers and inflatable modules.