[...]
There's a lot we cannot observe directly and there is every reason to believe that we grossly blew the mass estimates as it relates to the "normal" amount of material in a galaxy. There is at least twice the "dust" we expected to find and four times as many small stars in a galaxy than we realized.
Evidence?
Start with our own, the MW galaxy, and then either of the Magellanic Clouds, followed by any other MW satellite galaxy, followed by M31 and/or M33.
[...]
Like Neptune, I'm sure your "missing mass" is made of ordinary matter and baryonic materials.
I have no doubt whatsoever that you are, indeed, sure of this.
However, it has never been the case that the answer to a scientific question like this can be answered by asking MM what he is sure about ...
Perhaps you can put fingers to keyboard, and write a paper actually demonstrating this? And backing it up with quantitative analyses, unbiased sets of references, etc?
If you can't, what do you have, other than a personal, subjective opinion?
And would you have railed vociferously against all those who sought to test GR (the solution to the second lot of solar system dark matter, a.k.a. the anomalous advance of the perihelion of Mercury), because it had not been demonstrated in any earthly labs?
No because "gravity" shows up on Earth and does its thing right here on Earth.
Are you so grotesquely ignorant of the relevant history?
The original "dark matter" (Neptune) worked out just fine, in terms of the then prevailing theory of gravity (Newton's).
Starting around the middle of the 19th century, just the same sort of solution was sought to some new "dark matter" (i.e. the anomalous advance of the perihelion of Mercury) ... and it was even given a name (Vulcan).
Einstein's new theory of gravity did away with the need for a "dark matter" solution, but at the expense of a "dark energy" one (i.e. a theory which could not - then - be empirically tested in any lab on Earth).
An MM clone at the time (1918, say) would have railed most vociferously against this "dark energy" (i.e. an unsubstantiated theory of gravity), and insisted that astronomers lift their game in terms of searching for Vulcan.
And it was not until some four decades later - well after many of the leading astronomers of the day were dead, or had ceased any astronomical research - that GR was tested in a lab here on Earth.
Had MM been the ultimate authority on physics, at the time,
no one would even have tried to test GR!
I'm sure that gravity exists "out there" in space too.
Indeed.
The only thing - wrt gravity - that you're not sure about is whether a cosmological constant is required to adequately describe it ...
... well, you also are not sure of the validity of gravitational lensing, of the ISW, of the nature of the EFE, of ...
Compare and contrast that with hypothetical brands of SUSY particles with hypothetical properties galore that are entirely based on faith, starting with the claim of "longevity".
Just like the hypothetical Neptune (as it subsequently became known) and Vulcan (which remains entirely hypothetical)?
Oh, and the "
faith" basis is the same as the "
faith" basis for GR, the Standard Model (of particle physics), ...
Have the "professionals" in your industry even revised their mass estimates of normal material in a galaxy based on these new findings?
I was not aware that any of these "
new findings" referred to our own galaxy (the Milky Way) - can you point me to where, exactly, this reference is to be found?
Yes or no? If so, which paper would you cite for us? Has the Fermi team cited these new numbers in any single paper to date?
Why should they need to, if they have no relevance?