Reasonably, it would take things that have the capabilities to resist instant multi-light year spanning mind rape and take out celestial bodies with FTL speeds. So, admittedly a few things.
The Foundation could stop them, but they have other more immediate threats that call for their resources, so it's unlikely. The MIB have planet shielding tech, but nothing demonstrated as being capable of stopping something like the Brethren Moons, so they're out. If the Ghostbusters pulled off total photonic reversal, they could likely do it, but that's a high chance of negating the universe so it's likewise unlikely.
Maybe the Laundry could do something.