[zuminator]

A couple comments here are somewhat conflating dark matter, in general, with non-baryonic matter, which is what we presume to be the primary component of dark matter. Dark matter theories arose because the Milky Way and other galaxies are much heavier than they appear to be based upon the mass of objects in them that we can detect. Therefore we know there's something else out there that has mass, and is spread fairly evenly throughout the galaxy but is otherwise currently undetectable to us. We don't know enough to definitively say what that stuff is or isn't. Part of that mysterious stuff may be MACHOs (massive compact halo objects), which are just made of normal baryonic matter that's aggregated in bodies too small and dark for us to individually detect through existing means, such as small rocky objects which would be perfectly visible if we could get a spotlight on them, and also black holes, neutron stars, dwarf stars, and other dark objects. However, it's currently thought that the majority of dark matter is non-baryonic, which fits the exotic description of invisible and completely non-interacting except through gravitational attraction. MACHOs have the problem that if they're plentiful enough to account for the missing mass, we really ought to be able to detect them through other means. (And furthermore that if baryonic matter were the primary form of dark matter, it would be too abundant for our well-established theories of structure formation and nucleosynthesis to work.) But the bigger problem is that none of the theories of non-baryonic matter are in any way substantiated either, except for garden variety neutrinos, which don't have enough mass and are too energetic to account for the bulk of dark matter. This leaves the door open to even more exotic speculations such as tweaking the theory of gravitation. In a sense, the real darkness to "dark" matter lies in our understanding more than anything else.