>>12333996submitted too early
that doesn't happen to have an electromagnetic signature. In some sense it's a little presumptive to claim that all matter in the universe must give off light signals.
Either way, even if dark matter does turn out to be some other widespread phenomenon we don't yet know about/understand or even if it means there's a fundamental flaw in relativity when applied at large scales, it's still a very useful theory that will still be built on top of for centuries, just like we still use Newton's theory for many things.
Physicists don't view these theories as objective truths; they view them as stacked layers of interpretation/perception that are very useful models in many circumstances. All the top people already know and openly acknowledge relativity isn't 100% perfect and complete; it totally breaks down at blackhole singularities. That doesn't mean it should just be thrown out.
Same for quantum mechanics; maybe it's missing something big and isn't really what's fundamentally going on, but both relativity and QM have such unbelievable predictive value that they're going to remain relevant and useful for a very long time. And they'll probably always tell us certain objective things: e.g. many of Newton's gravity and force equations, and relativity's idea of the speed of light as constant and how time, gravity, and velocity are interrelated.
Even if there's some deeper fabric of reality undergirding all of this which we may not have any clue about for the next century, all of this information still edges us a little closer to objective truth.
