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How will they contact us? We need Galactical mailbox. And you don't know how to build one unless you already have one.

Earth's galactic mailbox is located near our local planning department in Alpha Centauri, only four light years away.

We should probably check it out just in case they plan to build a hyperspatial express route through our star system.

" ‘I don’t know’ said the voice on the PA, ‘apathetic bloody planet, I’ve no sympathy at all.’ "