Researchers from Instituto de Astrofísica e Ciências do Espaço (IA) have revealed significant results about the central spherical segment in spiral galaxies using data from the CALIFA Integral Field Spectroscopy (IFS) survey and advanced modeling tools, that may help us level up our knowledge of galactic evolution. Researchers had been doing the computational analyses for a couple of years to investigate approximately a half-million spectra from a sample. The computer models unveiled that the cosmic population at the center of the most massive spiral galaxies is older than the stars at the edge of central spherical component (the bulge), while in low mass galaxies, the youngest stars colonize the center of the bulge, and the older is in the outskirts. The researchers now use these analyses to estimate the influence of an active galactic nucleus (AGN) on the bulge and galactic evolution.