@layman,
Quote:For centuries now, scientists have convinced themselves that they "know" a "universal law of gravity." So what happens when objects no longer seem to "obey" the law of gravity?
Do they reject their theory as in any way lacking? Of course not!
They start making up **** (and LOTS of it) which, by definition, can never be directly detected because it doesn't in any way interact with light or any other matter. They call it DARK MATTER and DARK ENERGY.
Of course this "matter" is only present when some explanation is required to account for the observation that gravity is not "attracting" things in the required (by theory) degree, i.e., when things "should" (by prediction) be flying apart but are not.
But, this little device is quickly abandoned when there is a need to explain why gravity isn't stronger (rather than weaker) than it is predicted to be.
On those occasions a new anti-gravity "force" is created, ad hoc and ex nililo, which totally contradicts the "dark matter" invention. It is a new, "unknown cause."
Enter the equally mysterious and totally unobserved "dark energy" (which Einstein called the "cosmological constant" before he changed his mind--based on new evidence--at which time he removed it from his theory, calling it his "biggest blunder"). But now it's back again!
Are these completely unempirical, opposite acting, inventions coherent or consistent? It doesn't matter. It serves to salvage our theory of gravity, which we KNOW is indubitably true and valid, everywhere.
As a result, they now say that only 4% of mass/energy is in the form that we "know" it to be. The other 96% is "dark," unobservable, and unknowable (74% dark matter, and 22% dark energy, by one current account, anyway).
Now that's science, eh!?