Answer:
from collisions between other galaxies
Step-by-step explanation:
There are four types of galaxies based on their shape
- elliptical
- spiral
- barred spiral (a spiral with a bar shape across the galaxy)
- irregular
The irregular galaxies are named so since they do not fit any of the above three shapes
They are formed by the collision between two galaxies. The battle between the gravitational forces of the nucleus of the colliding galaxies will lead to irregular shapes