In order to make journeys through subspace, a ship must be shielded from its effects. Subspace eats away at matter from realspace as “time-shear” ages the outer surface of any object faster than the inner core. To protect passengers, a spaceship must have massively thick hulls (not a desirable solution, but one that was used in the pioneering of subspace flight) or they must project a steady stream of chaff to shield the bulk of the ship from the deleterious effect.
Ablative shielding was developed by the Thrameexis and quickly adapted by Human and Duurl vessels. Metallic chaff, which is loaded into baffles in the bulkhead and collected as the spaceship travels through interstellar gas and dust, is projected into an envelope of artificial gravity to shield the ship against the corrosive effect of subspace travel. The ablative shield also provides benefits in realspace combat. The reflective chaff is almost impenetrable to laser weapons, and is reasonably effective at slowing or deflecting missiles and torpedoes. The only limit is the amount of chaff that can be stored.