I think the largest issue with dark matter and it's cousin dark energy is that there is no observation of either, at all. What we see is a wobble here, or a me

I think the largest issue with dark matter and it's cousin dark energy is that there is no observation of either, at all. What we see is a wobble here, or a mess of background radiation and we suspect it may be something to do with this high mass non-radiating matter. I think this may be our modern ether. Though the theory of ether was far more interesting.