© Lloyd

A Galactic Bulge is a tightly packed group of stars in the nucleus of a galaxy.

There are Classical Bulges and Disk Bulges. Classical Bulges are composed primarily of stars with reddish hues; these stars are in largely random orbits, giving these Bulges spherical forms. They have little dust or gases and apparently very little star formation.

Disk Bulges have stars that are orbiting largely in the plane of the galaxy. The Disk Bulge often has a spiral structure with much dust and apparent star formation. Some Bulges contain nuclear rings where star formation is more prolific.