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M1K-439 was a planet in the Pegasus galaxy which held a Stargate. It was one of many locations scouted for use as the Atlantis expedition's Pegasus Alpha Site during the expedition's first year. Major John Sheppard reported that it contained many waterfalls, leading to Lt. Aiden Ford suggesting the name Planet Waterfall. The planet was ultimately rejected as the expedition's Alpha Site, and it is unknown if Ford's nickname stuck. (SGA: "The Siege, Part 1")