2 ms·
Regarding the "no massive dark bodies" result: does this also cover dark dust? Or is that otherwise ruled out (perhaps by optical density)?
by semi-extrinsic 10y ago
Regarding the "no massive dark bodies" result: does this also cover dark dust? Or is that otherwise ruled out (perhaps by optical density)?
- maverick_iceman 10y agoBaryonic dust is ruled out by BBN.
- okket 10y agoIf you have four times of visible matter as "dark dust", this dust would clump together, creating stars, becoming visible matter again.
- tomr_stargazer 10y agoAdditional dust inside a given galaxy would both absorb optical light and emit infrared light (depending on its temperature, which is set by the Galaxy's ambient starlight among other factors); both effects are readily detectable.