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Originally Posted by Cranberry Tea
This isn't really a plot hole, but how in heck did Darth Vader & the Emperor manage to keep a moon-sized weapons platform a secret from their own government? That must have taken some really creative bookkeeping.
The same way that the First Order built and kept the new death star a secret in TFA. Even though the First Order is much smaller than the empire, has way less money, power and influence than the empire did and is essentially the new rebels, compared to the new republic.