Vorash, a barren, rocky desert planet, was used as a base by the Tok'ra and was the venue for the negotiations for the Earth-Tok'ra treaty. When the Tok'ra planned to relocate to a more permanent and secure base not on the Goa'uld map, they evacuated Vorash and intended to bring the stargate with them. However, SG-1 used the opportunity, and the stargate, to create an artificial supernova from Vorash's sun in order to destroy Apophis's fleet, and the entire solar system was wiped out.
Cross Reference: Aldwin, Anise, Apophis, Black Hole, Major Graham, Hebron, Jalen, Per'sus, Supernova, Tanith, Tok'ra, Tok'ra Tunnels
Episode Reference: Jolinar's Memories, The Devil You Know, Crossroads, Divide and Conquer, Exodus