​A concept study at the Jet Propulsion Laboratory concludes that it actually is possible to get humans to Mars in the 2030s. That is NASA’s official goal, but the agency’s plan for doing it probably will not work without an unlikely budget boost. “If you want to be at Mars in 2033, you either have to have a budget that’s two or three times NASA’s current human spaceflight budget, even with inflation,” says former NASA “Mars Czar” Scott ...

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