Answer by Graham for How do we know that dark matter is dark?
It's "dark" in the sense that it has not been detected. This is not to say that it has a dark colour, like coal or something, it's "dark" in the sense that it's hidden from view.So this tackles the...
View ArticleAnswer by rfl for How do we know that dark matter is dark?
Adding two points that havent' been made here yet:I would argue that observations of Baryon-Acoustic Oscillations in the power spectrum of the Cosmic Microwave Background are actually the strongest...
View ArticleAnswer by ProfRob for How do we know that dark matter is dark?
Dark matter was originally called that because it was matter.... that was dark. In other words, it was inferred that there must be something out there, in galaxies and in clusters of galaxies, that had...
View ArticleAnswer by Aryan Beezadhur for How do we know that dark matter is dark?
Note: this answer is similar to this one also written by me. That question is very closely related and an interesting read.How do we know that dark matter is dark, in the sense that it doesn't give out...
View ArticleAnswer by Omega Centauri for How do we know that dark matter is dark?
Aside from the very good theoretical reasons dbrane gives, I'd say that we don't have observational evidence that DM is truly dark. Some of the largely discredited MACHO candidates, like large numbers...
View ArticleAnswer by Lawrence B. Crowell for How do we know that dark matter is dark?
If dark matter emitted very long wave lengths of electromagnetic radiation it would mean it is composed of charged particles. There is no escape from that conclusion. Somebody might propose that dark...
View ArticleAnswer by dbrane for How do we know that dark matter is dark?
There is indeed very good reason to believe dark matter is dark - apart from all the evidence from "missing mass" in luminosity counts and gravitational lensing studies.This comes from theories of...
View ArticleHow do we know that dark matter is dark?
How do we know that dark matter is dark, in the sense that it doesn't give out any light or absorb any? It is impossible for humans to be watching every single wavelength. For example, what about...
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