“The scientists have proposed that these life-bearing planets originated in the early Universe within a few million years of the Big Bang, and that they make up most of the so-called “missing mass” of galaxies.”
Goodbye ‘dark matter’, Hello ‘missing mass’.
The whole “dark matter” issue assumes there is a truly massive volume of matter we can’t see or detect. This is purely to explain anomalies between what our theories of relativity predict and what we observe.
It’s always seemed to me that good science would instead attempt to develop new theories that explain what we can observe, rather than assuming stuff exists that we can’t see.
Shades of the old aether theories.