Pluto
From Halopedia, the Halo wiki
Pluto is a large celestial object in the Solar System, and the second-largest known dwarf planet (after Eris) and the tenth-largest body observed directly orbiting the Sun. The Remote Scanning Outpost Democritus. On November 3, 2552, the Monitoring Station detects Cortana's signal in Slipspace with Dr. Halsey's message to Lord Hood.[1]
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Sources
- ^ Halo: Ghosts of Onyx, page 212