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A theory should agree with observations.
Our theory on gravity does not agree with observation.
To explain the gallactic rotation curves and fit the theory we need an extrodinary amount of mass...mass which only reveals itself via our theory on gravity.. seems like a dog chasing its tail.
The theory did not predict the observations...clearly we can not "see" all the mass our theory says must be there... what if the theory is wrong as to this aspect?
Should we change or amend the theory or should we make the observations fit the theory?
Well by making the observations fit the theory we end up with most of the Universe being unknown to us...other than how it reveals itself via our theory...
The great thing is that folk are occupied on this and in the long run we should learn more be that we are currently wrong or that indeed stuff is out there that we can not detect...except via our current theory on gravity.
To find a better theory seems most difficult for to do so would seem to mean some of GR will need changing and if that is so how will that effect other matters dependant on GR.
Exciting times.
alex
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