Cosmologists have proposed dark matter for the cause of unexplained motions in a galaxy.
Dark energy has been proposed for the cause of unexplained large velocities of distant objects. Dark fluid has been proposed as a solution for both problems that dark matter and dark energy attempt to explain.
Dark matter, dark energy, and dark fluid have a critical detail in common.
None of these theories has a defined test to verify the theory is right or wrong. They have been proposed with no way to look for evidence of their presence. They are just 'dark' or undetectable.
The scientific method is 1) construct a hypothesis, 2) test it, 3) analyze results.
Without a test to confirm or deny that hypothesis science has not moved forward.
An untestable theory, with no way to falsify it, can be compared to Russell's teapot.
Russell's teapot is an analogy, formulated by the philosopher Bertrand Russell (1872–1970), to illustrate that the philosophic burden of proof lies upon a person making unfalsifiable claims, rather than shifting the burden of disproof to others.
He wrote that if he were to assert, without offering proof, that a teapot, too small to be seen by telescopes, orbits the Sun somewhere in space between the Earth and Mars, he could not expect anyone to believe him solely because his assertion could not be proven wrong.
For example, how do we test whether dark matter is the correct solution for each galactic anomaly? What if the correct solution is something previously unknown in the galactic halo? We need to know what to look for. Cosmologists have not defined a test to verify or deny the presence of dark matter, dark energy, or dark fluid.
Without a test, they are just imaginary concepts. This is not science; it is magic.
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