Absolutely the evidence needs to be provided. That makes sense. What I am asking is what if? What if we will never know. If you toss away what ou know for a minute, why can't this idea have some value?I fully agree. No one is advocating that we simply make up a new theory of gravity. Any alterations that would come about would only happen because the evidence supports doing so. The objective evidence needs to be the reason. For the record, I am not ready to throw in the towel on the search for dark matter. We have evidence today of the existence of so many more fundamental particles then were ever imagined 100 years ago. It is a product of figuring out where to look and having the technology available to do so.See and I disagree some what. It is likely we will never discover the source but at the same time, and changing our understanding is fine, but we would need a reason to do so.I think my previous, post that was being written before seeing yours here, addresses some of the questions you raise here about knowing it all...Ok so. If we can move on from that. I am unbelievably, monumentally sorry I used the word "theory." I really honestly and truly didn't know it would have such a massive impact. So I changed my post.
Now to your second paragraph, since we have hopefully moved on from my guffaw. My point it no one yet understands what dark matter is. We can detect it, somewhat. But we don't know what it is. Are you saying from your chair the laws of physics that we have drawn are the absolute end all be all and there is absolutely no possible way things can interact in a different manner? Are you taking the somewhat human centric position that we know it all? Cause I don't buy that, for a hot second.
On the specific issue of dark matter, you are right. We have no idea what it is. We definitely see evidence of its existence based on our current understanding of gravity. However, we have been searching fruitlessly for quite a while now. Either we are going to eventually find the source OR we are going to have to adjust our understanding of gravitation to incorporate what we see and measure. There are some who are starting to doubt the existence of dark matter. We know our theory of gravitation is at best incomplete because we can't currently reconcile it with quantum mechanics.
ETA...whatever adjustment may come in the future for our theory of gravity would not discount what we already have established. We have been using our current understanding of gravitation very effectively for long a time. There must be merit to it even if incomplete.