The more massive the bulge of a galaxy, the redder the galaxy, says a team of astronomers reporting in the journal Monthly Notices of the Royal Astronomical Society (arXiv.org). A collage of face-on, upper panel, and edge-on galaxy images from the SDSS sample. In both panels, from bottom to top galaxies increase in stellar mass. From left to right galaxies increase in bulge-to-total stellar mass ratio. Image credit: Asa Frederick Bluck. The Universe...