P3X-474 is a planet which has a Stargate and DHD. The Odyssey, while under attack from the Ori, traveled to the planet and beamed down all of its crew except General Landry and SG-1, so that they can return to Earth safely. Shortly after SG-1 created a time dialation field to protect themselves from an incoming blast form an Ori mothership. They were inside of it for around 50 years before they finally figured out a way to reverse the field and escape. (SG1: "Unending")
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