«Till recent years, in the paradigm of galaxy formation and evolution, elliptical galaxies were thought to have formed by the merging of stellar disks in the distant Universe. (sciencedaily.com)
The resulting disk has a series of vibrational «modes,» rather like resonances in a tuning fork, that might be excited by small disturbances — think of a planet - forming stellar disk nudged by a passing star or of a black hole accretion disk in which material is falling into the center unevenly. (scientificamerican.com)
Astrophysics: A joint European - US study led by experts from Niels Bohr Institute (NBI) at University of Copenhagen, Denmark, reveals a rotating stellar disk à la the Milky Way in a stone - dead galaxy 10 billion light - years from Earth. (sciencedaily.com)