How do astronomers believe an irregular galaxy forms?
A)Several regular galaxies of different sizes merge.
B)They form when an elliptical and a spiral galaxy merge.
C)They are regular galaxies that are distorted by the gravity field of a large nearby galaxy.
D)They are two or more galaxies that have not completed their merger.
E)They are young galaxies that have not yet developed a more regular form.

Question

Quizplus · Accepted Answer

Irregular galaxies are believed to form from the gravitational interaction between regular galaxies. In particular, a large nearby galaxy can distort the shape of a smaller galaxy, turning it into an irregular form. This process is known as tidal disruption, and it can also result in the formation of tidal tails extending from the irregular galaxy.

How Do Astronomers Believe an Irregular Galaxy Forms