Developed by Samantha Carter at Area 51, the Mark IX is a naquadriah-enhanced nuclear weapon "designed solely for the purpose of vaporizing Stargates and anything else within a 100 mile/160 kilometer radius." It has a yield of 812 Gigatons (812,000 Megatons). This is no small feat, as Stargates have proven extremely durable. (See note below.) The bomb creates a multi-gigaton detonation. It has built-in safeguards that prevent it from being deactivated by electromagnetic countermeasures or any form of tampering. When the bomb was first used, it failed to destroy the gate in question, which was being protected by an Ori Prior. The second time the weapon was used, against an Active Stargate in the Pegasus Galaxy connected to the Milky Way Supergate, the Gate was successfully destroyed and the