“Dark Matter” is discovered all the time, and the gusto with which it is proclaimed should make me nauseous.
“Dark Matter” == BBT predicted matter – observable matter. The acceptance of an unprovable concept by the larger astronomical community is contemptible.
Most people consider a discrepancy between theory and measure to mean the theory is bad, especially if the relative error is high. An 85% error rate in any class lab experiment would earn you a failing grade and some public ridicule. (Number derived from the wikipedia entry for Dark Matter.) Yet, this is how gravitation-only cosmology matches up to measure.
Like so many other facets of modern Big-Bang theory, Dark Matter was not predicted by or a part of the theory before it surfaced as a discrepancy. Adding on another strut to fill in that hole is somehow reminiscent of other patchwork on top of a idealized/idolized belief.
— Charles Wilcox
P.S. Sorry for being a little off topic; this isn’t exactly about how gravitational lensing is invoked to alleviate the behavior or galaxy clusters.