"solved" is such a strong word for a theory, based on another theory, that led them to theorize yet another theory. It should read "scientists uncovered another piece of the puzzle to one of the universe's oldest mysteries". I hate sensational clickbaity bullshit, especially in science. These scientific discoveries are interesting as it is, and there is no need for this bullshit.

Lots of small galaxies vs large black holes or other stuff helped create the cosmic dawn.