Putting mass into space is expensive.... And given how low gravity is on some places like the moon....wouldn't going to the moon first make more sense.
The moon is literally free mass, its already in space and we just need to refine it.
The moon is also closer to the earth so it can be used as a launch off point.
"Defining objectives" is not the same as "building rationale".
"Defining objectives" takes the rationale as a given.
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