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Originally Posted by xelasnave
Hi Malcolm
I think the most exciting thing we can do is to find such a question as you raise. Your interest in such matters will be stimulated and until you find an answer that is satisfying such question will remain and guide your reading perhaps.
Given the fact that gravity travels at the speed of light any gravity message will take some 150,000 years for stars on the outer edges to be received one edge to the other (assuming you think gravity must have a messenger particle) now this means that if one relies on attraction within the galaxy stuff should fly apart..it seems not to..at least in a radical fashion... I think dark energy is also enlisted to explain why this will not happen..it presents as an external force not only to explain an expanding universe but to explain why galaxies simply dont fly apart. With the information you provide it seems its time for speculation as to what the heck is happening and irrespective of coming up with the right or wrong answer it is the consideration of the matter that is important.
alex
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I wasn't theorising but am quite happy to keep my thoughts as I learn a little more (call it brain stimulation). I think we can safely say that findings are changing and that maybe we should looking for mass/matter that is more easily identifiable than the current theory of some invisible mass.
There is about 3 notable thread running at the moment including massive more suns than predicted (I am not good at tracking down posts), that could bind a relationship in the whole concept of matter in the galaxies and their affects.
Craig I understand the thread no problems there he spiral arms are sweeing through and could create turbulence as well that could cause rotations of stars and system all over the place, this in turn could produce gravitational anomolies that are holding the arms together or fly apart.
When dark matter was first theorised, it was deemed a theoritical matter not discovered so was given a name adhoc. I "feel" that time has distorted the meaning and now looking for something specific that may specific properties, yet tripling the number of suns could lead to answering that theory along with load of other unseen objects including light dust. These are object that at the time were not visible matter and now can be seen.