... Gravitational wave search provides insights into galaxy evolution and mergers . ... Dark galaxies of the early universe spotted for the first time . ... For the first time, dark galaxies т?? an early phase of galaxy formation, predicted by theory but unobserved until now т?? may have been spotted. ... Dark galaxies are small gas-rich galaxies in the early universe that are inefficient at forming stars. ... These are the most convincing identifications of dark galaxies in the early universe to date. ...