Horizon

Horizon is the code name of a tactical weapons system developed by the Tau'ri.

The system consists of a large, bullet-shaped delivery module containing ten missiles, six with Mark IX tactical warheads and four decoys. The device can be carried in the bomb bay of a DSC-304 like the Apollo. Deployed from orbit, the module's three rocket engines propel it into the atmosphere; these rockets shut down and the missiles themselves are released about twelve seconds prior to impact, finding individual targets and detonating all but simultaneously. The total time from launch to detonation is about one minute.

So far, the system has been used once in combat conditions, by the Apollo in a pre-emptive strike against the Asurans in the Pegasus Galaxy. The system performed without a hitch, destroying all of the primary and most of the secondary targets identified for the mission.