[balfirevic]

> Whereas he's proposing regular (dark as in color) matter

Wouldn't that kind of matter be easily detectable because it would block EM radiation, including visible light?

[corty]

Yes. "Dark" is misleading, it should be "sparsely-interacting" or something. Well, MACHOs would have been dark in the traditional sense as well. Generally, "we would have seen it" excludes a lot of dark matter candidates, thats what actually makes it "dark"