Dark matter is probably a grouping of several phenomena like this. Should not discount MACHOs just because it doesn't explain all the dark matter observations.

Dark matter is probably a grouping of several phenomena like this. Should not discount MACHOs just because it doesn't explain all the dark matter observations. I think I remember reading in Carroll's Astrophysics Intro that MACHO's can explain about 10-20% of dark matter. Dark matter could be potentially be explained fully by multiple dark matter explanations, each adding to the overall phenomena.