Question

What does a spiral galaxy look like

Answer 1

The arms of a spiral galaxy have lots of gas and dust, and they are often areas where new stars are constantly forming. The bulge of a spiral galaxy is composed primarily of old, red stars. Very little star formation goes on in the bulge.

Answer 2

Exactly what it's named after: a spiral. Think of a spiral galaxy like a CD disk. The arms of it are filled with stars, dust, gases, etc.