The Interplanetary Defense Grid consists of over 100 weaponized stations situated across the Sol system to deter or prevent the destruction of Humanities Sol Fortress.
The Weaponized stations use highly experimental wormhole cannons to effectively fire rounds across the Sol system in only a matter of seconds. Reducing the travel time of the bullets significantly. This prevents any attacker from accurately determining incoming fire as the stations do not have to be facing their intended target.
Due to the unstable nature of nearly all wormholes generated by anything smaller than a starship, the weaponized platforms lack the ability to fire beyond the celestial body of Pluto.