Halla was a planet in Ida that was taken over by the replicators in 2002. In November 2002, the crew of the Prometheus as well as SG-1, SG-2, SG-3 were taken to the planet by the Asgard to help them make the time dilation device on the planet work properly. In June 2004, the planet was destroyed when the Asgard collapsed Halla's sun into a black hole.
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