What specific cost estimate was cited as being around $7.9 quintillion in 2012 dollars for a complete, operational Death Star?

Answer

Various sources factoring in manufacturing and assembly

When manufacturing, assembly costs, and specialized construction involving orbital dry docks were included, estimates for the first operational version settled around $7.9 quintillion in 2012 currency.

What specific cost estimate was cited as being around $7.9 quintillion in 2012 dollars for a complete, operational Death Star?

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