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A combination of liquid oxygen and liquid natural gas powers these engines, a mixture that’s “not only the best for rocket propulsion, but also for reusability, and the easiest to eventually transition to methane on Mars,” according to the company.
Source: https://gizmodo.com/relativity-space-terran-third-launch-attempt-3d-printed-1850252285
More than $1 billion would go to space and flight support, such as communication and navigation, human research programs, launch services, space flight operations and rocket propulsion tests.