Irregular galaxies have no distinct shape and contain both old and new stars.

Elliptical galaxies, having no structure have a mixture of Population I and II stars.

Elliptical galaxies are relatively rare and contains only one fifth of the galaxy population.

Spiral galaxies also contain three quarters of all the galaxy population. : :

Spiral galaxies contain a central disk surrounded by spiraling arms and control new stars.

The disk, bulge, halo, and the signature arms are the 4 key components of a spiral galaxy.

Every irregular galaxy is located in the Southern Hemisphere

Large elliptical galaxies contain up to 104 times more habitable planets than the Milky Way.

Elliptical galaxies have a broader range in size than other types of galaxies.

All galaxies are formed in the same manner through gravitational forces.

Elliptical, spiral, and irregular galaxies all form a mixture of stars, interstellar dust, planets, and gases.

all bound together by the force due to gravity

Almost all distant stars orbit at about the same speed as stars located about 30,000 light-years from their centers.