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Am I right in thinking no one has been able to detect dark matter despite decades of attempts and research? My understanding is that based on observations of w
by account-5 4y ago
Am I right in thinking no one has been able to detect dark matter despite decades of attempts and research?
My understanding is that based on observations of what can be seen galaxies move as if there's move stuff in them??
If you hypothesis that this extra stuff is dark matter but can't detect it, how do you know it's real?
How have you ruled out all the normal stuff that doesn't give off light or stuff we can't see at the distances we're looking over? Like planets, rocks, dust, etc. Couldn't that stuff, which to my mind there would be vastly more of than stars, make up the extra gravity?
I'm aware I might be talking complete shit because I'm completely ignorant of the detail here. I would love an understandable explanation as to why that's wrong.
- negativelambda 4y ago> Am I right in thinking no one has been able to detect dark matter despite decades of attempts and research? Yup [1] > My understanding is that based on observations of what can be seen galaxies move as if there's move stuff in them?? Yup [2] > If you hypothesis that this extra stuff is dark matter but can't detect it, how do you know it's real? It produces certain effects in various different enviromennts or domains, which lends more support to that hypothesis. By certain different domains, I mean like Galaxy and cluster dynamics, gravitational lensing around galaxies and clusters and the precise fluctuations seen in the cosmic microwave background, these are all very different regimes but all seem to support the hypothesis of extra mass which is not interacting electromagnetically. > How have you ruled out all the normal stuff that doesn't give off light or stuff we can't see at the distances we're looking over? There are research efforts to look for exactly this kind of stuff; Massive compact halo object (MACHOS). However they don't see enough of it to account for the observations we see in galaxies and galaxy clusters. [3] [1] https://lss.fnal.gov/archive/2022/conf/fermilab-conf-22-180-v.pdf https://lss.fnal.gov/archive/2022/conf/fermilab-conf-22-180-... [2] https://en.wikipedia.org/wiki/Dark_matter#Observational_evidence https://en.wikipedia.org/wiki/Dark_matter#Observational_evid... [3] https://en.wikipedia.org/wiki/Massive_compact_halo_object#Detection https://en.wikipedia.org/wiki/Massive_compact_halo_object#De...
- exmadscientist 4y agoI hate to be that guy, but many of those points are exactly the subject of this article.
- lkrubner 4y agoSort of, but gravitational lensing has been seen in places where there is no visible matter. If dark matter doesn't exist, then you'd have to come up with another explanation for the gravitation lensing: https://kipac.stanford.edu/highlights/using-gravitational-lensing-hunt-hidden-knots-dark-matter https://kipac.stanford.edu/highlights/using-gravitational-le...
- Beldin 4y agoYou're absolutely right and this is the one thing about dark mayer that doesn't sound like "just keep sprinkling it on your problem till it works." I don't know enough about the found examples of gravitational lensing to know whether all possible arrangements of black holes that could have the same effect, have been considered and found lacking. But I presume so.
- dbdoskey 4y agoWell it definitely is one of the proposed solutions https://en.wikipedia.org/wiki/Primordial_black_hole https://en.wikipedia.org/wiki/Primordial_black_hole https://en.wikipedia.org/wiki/Massive_compact_halo_object https://en.wikipedia.org/wiki/Massive_compact_halo_object