Jared The Null-Space shields prove to be extremely hard jawbreakers to the dimension that is consuming them. Eventually, however, a part of them breaks as the Sentinel ships go super-sonic speeds towards (one of) the planet(s), eventually they crash into it and explode, unstable, fiery anti-matter blanketing the planet and the rest of the dimension with two very large, very hot explosions.
However, unless the planet served as some sort of core/brain like the DC predicted, the pain was more akin to tasting a ghost pepper than getting full-body burns.