Madrona

Madrona, or PX7-941, is a planet, that was terraformed by unknown aliens roughly 900 years ago. In order to maintain the weather on Madrona, the Touchstone_(device) is necessary. It was inhabited by the Madronans, a primitiv race, who had not the technology to terraform the planet, but the knowledge on how to use the Touchstone.

After it's terraforming, Madrona became a Earth like planet with a nice climate, which could easily turn into a deadly blizzard, if the Touchstone was not used correctly or missing.

SG-1 visited the planet once, and returned after five weeks, in order to study the Touchstone. But it was stolen by people in SGC uniforms. SG-1 agreed to recover the Touchstone, which they eventually did, after discovering, that Earth's Beta Gate was used by the NID (SG1: "Touchstone")