Dwarf elliptical galaxies in particular are the most common type of galaxy in the nearby universe. Their stellar populations reveal a complex star-formation history. We do not completely understand how they formed, when they started forming their first stars, and what processes influenced their subsequent evolution. HST and other telescopes are being used to detect and study stars torn from galaxies during the formation and evolution of galaxy clusters. Hot stars in elliptical galaxies.
Some elliptical galaxies appear to have more hot horizontal-branch stars than others.
But we are not sure what. Inc. All rights reserved.