Dark Matter is matter that we can’t see as it doesn’t reflect light, so our detectors can’t reveal it. Dark Energy is energy from the Universe which we know should exist but can’t see and now don’t fully understand. RecentlyI was asked this question, and this is the response I gave, perhaps you can clarify it better, if that’s the case, that only shows your intelligence and comprehension of these concepts.
So, perhaps the equation is wrong, or there’s something else. Indeed, there’s always’something else’ right? For example if you count the amount of cows in a field and then choose that number out of cows, then there are not any cows and your equation of this finite set is zero or neutral, however there’s still grass, insects, and an occasional critter living in a hole, like a gopher, field mouse, hedgehog, mole, etc..
If you do not know what is there, they are, as soon as you know, you must modify the equation or add that gap. Whatever is there which we now call dark matter – or dark energy based on the way the equation is finally balanced out, providing it’s correct, it will not be dark once we understand. We also understand that things can change from matter to energy and/or maintain a country in between.
If our basic understanding is away, our equation is clearly off. Problem is we do not understand and many suspect components which are missing. Transition particles for example, new states of matter we do not know about. If our world wraps around itself we’re measuring some things twice, thus off. We may also be missing to quantify what we can’t yet observe, or have mislabeled and wrongly measured as other than it is.
If photons have a very little mass, but there are so many to light everything up, maybe that’s the missing problem, if light is bent around and around objects, there’s far more of it than we are measuring, how much? If the universe isn’t expanding, but the light is moving around, it may seem to be expanding when it is not, then the equation will not fit . I have numerous questions on all this stuff. From what I’m reading and all of the sub-theories, it’s possible we’ll get to the answer shortly – that is if somebody has not already figured it out but isn’t thought of as a learned physics specialist so none of the papers are deemed worthy, if they’ve written whatsoever.