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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Infinity has a Forerunner slipspace drive, which means they can travel far faster than any other Human or Covenant ship. [Edited on 12.29.2012 1:39 PM PST]