K'tau

K'Tau is a planet in the Milky Way, and under the protection of the Asgard as a part of the Protected Planets Treaty. The planet is closer to its sun than most other inhabited planets. While travelling to it, SG-1 accidently introduced plutonium into the star's reaction, causing it to shif to the red spectrum. They attempted to contact Freyr, hoping he would help, but after speaking with the Asgard High Council, they stated that they were unable to do so, per the treaty. SG-1 then tried to send McClarium up into the sun via a rocket, but some of the locals destroyed the rocket. Samantha Carter then tried sending the McClarium through the Stargate, hoping that she could deactivate it soon enough to rematerialize the McClarium to reapper in the sun. Whether her plan worked or the Asgard intervened is unknown, but K'Tau's sun soon shifted back to the yellow light spectrum.