At the end of the Ark in Halo 3, the cartographer shows that the Ark is outside of the Milky Way's rim. From the end of Halo 3, Requiem appears to be close to the Ark. How did Infinity get there?
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I think we should all recall that the Didact and Chakas were both at Installation 03, along with the Composer. Would it be that surprising for the information of Requiem to be stored with other relevant materials and data, and/or the Forerunners leaving behind something from a blown up ship?