Question

Elliptical galaxies and the halos of spiral galaxies contain groups of stars called what?

Answer 1

A galaxy contains stars, gas and dust. In aspiral galaxy like the Milky Way, the stars, gas, and dust are organized into a "bulge," a "disk" containing "spiral arms," and a "halo." Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.