[Yossarian]

Actually, I believe a simple inspection of the rate of rotation of the outer parts of the arms of a galaxy compared to the inner parts of the arms indicates that there is something heavily unexplained in our understanding of matter and its distribution.

"Dark Matter" and "Dark Energy" are simply terms to label what is currently misunderstood in our limited understanding of physics. It doesn't mean those term are invented out of a need for prevarication.

[stormhill]

Maybe so.
Nevertheless if 80% of the universe is composed of matter that does not organize itself into atoms or molecules, this hyperfluid or whatever it is should be everywhere; why aren’t we pumping it out of the cellar rather than searching for it with the most sophisticated instruments imaginable.

Dude, 80 PERCENT!