This is a "typical" logical fallacy that is used by mainstream astronomers to try to fool the public into believing that there is actual evidence of exotic forms of matter. No such "evidence" actually exists.A new study, led by a theoretical physicist at the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab), suggests that never-before-observed particles called axions may be the source of unexplained, high-energy X-ray emissions surrounding a group of neutron stars.
https://en.wikipedia.org/wiki/Affirming_the_consequent
In this particular case, there is *zero* empirical laboratory evidence that axions even exist in nature, let alone any actual "evidence' that they emit xrays. This a classic example of an "affirming the consequent fallacy". In this case it's based on the observations of x-rays. It's akin to claiming 'x-rays are observed, therefore axions did it." There is no empirical correlation between the observation of x-rays in space and axions. The correlation is simply *assumed*, and then the very same evidence is used to try to support the claim. It's a completely circular argument. It's only one immoral step up from the blatant "bait and switch" routine that mainstream astronomers use to try to support "space expansion" as a cause of redshift when they talk about Doppler shift in relationship to redshift. Doppler shift is caused by *moving objects*, not "space expansion" and "space expansion" has never been shown to actually cause redshift in a real laboratory experiment. It's simply an "assumption" they make, nothing more.
When you really sit and look at the so called "evidence" to support mainstream astronomy claims, they are almost *always* based on some sort of an affirming the consequent fallacy that goes something to the effect "Something (X) is observed in the sky, therefore (dark) Y did it", in the complete absence of any empirical laboratory justification for the existence of (dark) Y, or any evidence that Y is physically capable of causing the observed phenomenon.
The whole expansion model of cosmology is nothing more than a series of affirming the consequent fallacies all stuffed into a single logically fallacious metaphysical house of cards.