Problems in Mainstream Science
Dark matter or Dark energy according to mainstream science, are fact, even though they have never detected it. They predict it should be there, they use this “fact”, and they build upon that “fact”.
But the real story behind dark matter is like many of the problems in mainstream science is its origin. Dark matter was postulated because the speed of stars at the edge of the galaxy move faster than what Kepler or Newton predicts.
Critical thinkers however can describe the stars velocities in the galaxy without having to resort to dark matter or dark energy, thus eliminating it all together.