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Both Elon Musk's SpaceX and Jeff Bezos' Blue Origin have fixed-price contracts with NASA to develop lunar landers. SpaceX plans to use its Starship megarocket " a gargantuan rocket system that Musk originally billed for Mars travel " for the task. Starship is still in the early stages of development and over the past year prototypes have exploded during brief, suborbital test flights. Meanwhile, Blue Origin is building a lunar lander that looks more like a traditional, Apollo-style vehicle. But the company has not yet launched a test flight.