1. Elliptical galaxies are roughly egg-shaped found largely in galaxy clusters and smaller compact groups.
  2. The largest elliptical galaxies can be over a million light-years in diameter while the smallest, called "dwarf elliptical", can be less than 1/10 the size of the Milky Way
  3. Most starts in an empirical galaxy are older and have a low mass because these galaxies have very little gas and dust, which is what forms stars
  4. Astronomers think that every elliptical galaxy has a central supermassive black hole that is related to the mass of the galaxy itself.