In simple terms, subspace is an n-dimensional tunnel between one point in the universe and another. A vessel can travel through this tunnel in a matter of minutes, making a journey that might otherwise take decades or even centuries at light speed.

A jump drive causes a ship to vibrate in multiple dimensions until its modulations are in perfect synchronization with the subspace continuum. A vortex opens, creating an aperture from an infinitesimally small point in the cosmos, enabling the vessel to cross the subspace threshold.

Two types of jumps are possible.

First, an intrasystem jump can occur between two points in a star system. Most small, space-faring vessels are equipped with motivators capable of these short jumps. The presence of an intense gravitational field is required, prohibiting travel beyond the boundaries of a star system.

Second, ships can jump from system to system via nodes. Until the Great War, only larger ships could generate sufficient power to use jump nodes. The development of jump drives for fighters and bombers in 2335 enabled the Alliance to destroy the SD Lucifer in subspace. Producing these small jump drives is prohibitively expensive, so they are restricted to missions that require pilots to travel between systems. The Head-Up Display indicates the location of jump nodes with a green sphere.

The vast majority of subspace nodes are extremely unstable, forming and dissipating in nanoseconds. Other nodes have a longer lifespan, existing for centuries or millennia before collapsing. The jump nodes sanctioned by the GTVA for interstellar travel are expected to remain stable for many years.

Shivan vessels have exhibited the ability to traverse unstable nodes. This capability was put to extensive use during the Great War. The GTVA maintains a continuous watch for the formation of new unstable nodes in Vega, in case the Shivans attempt transit from Capella.

The tactical details of intrasystem jumps are of vital importance to modern space warfare. A warship's subspace drive must take time to recharge between jumps. Additionally, a jump solution must be calculated, a process which may take considerable time depending on the precise position of the departure and destination coordinates, the presence of massive objects along the jump path, and even the unpredictable nature of subspace itself.