The "what is special about this planet over all other planets" discussion of amorphia in the context of physics reminds me that the not-very-useful analogy to antimatter is relevant here. Particle physics has long produced large numbers of antimatter protons and electrons, and recently groups have produced antimatter atoms in sizable quantaties (though not in the most useful possible form). Astrophysics tells us that there is no indication of the existence of antistuff anywhere else in the universe. If there are aliens out there with post-20th-century labs, then never mind, but as far as I know there are no dense quantities of antihydrogen anywhere but here.