This isn't the first piece of evidence that has contradicted Einstein, and it will probably not be the last. Scientists have unfortunately gotten into a real bad habit of ignoring the unpleasant truth. Sometimes they want to preserve what they see as a sublimely beautiful theory so badly that they will go so far as to violate the basic principles of Science itself to maintain the theory of General Relativity.
Which is why we now have Dark Matter and Dark Energy. Stars moving faster then they ought to under the theory of General Relativity. No problem we will just say there is more stuff. You cannot see more stuff you say. Well we will say it is a new kind of matter that only exerts gravity, and is entirely invisible to detection. Just to make all the math add up just right. We will even say that there is three to four times of this new stuff then there is of stuff we do see.
What the Galaxies are moving away from each other faster rather then slowing down. Well we most certainly will have none of that defying General Relativity nonsense. Lets see oh how about we add another new fundamental force to the Universe, and its only job is to make the Universe expand faster. Oh since the whole dark naming has really captured our imagination. Why not just use that again. Nope they aren't related to one another at all. Just do whatever you have to do to make General Relativity work. The contradictory evidence be damned.
The reality isn't that General Relativity has been unassailed. It has countless times, and Physicists have gone to just plain ridiculous lengths to pretend it has not happened. Invoking cloaked matter, and entirely new forces are just the latest examples, and frankly they are unjustifiable under the scientific method. You cannot just fabricate some outlandish explanation in order to make the data fit a theory, and that is what these hypothesis are outlandish. To make a extraordinary claim you need extraordinary proof. Not a complete lack of evidence.
Personally I think the excuses have just become too much to swallow. When what the most logical conclusion is that there is indeed something wrong with the theory. We may just need to get comfortable with the fact that the theory is flawed, and the Universe just isn't that beautiful.







