Question

Which of the following best describes the gravitational binding of galaxies?

A. They are arranged from smallest to largest.
B. They often violently collide because of their absence of gravity.
C. They are found in clumps called clusters or superclusters.

Answer 1

The correct description of the gravitational binding of galaxies is that they are found in clumps known as clusters or superclusters, which continue to attract more galaxies and gas and may even merge with one another. Option C is correct.

Step-by-step explanation:

The best description of the gravitational binding of galaxies is C. They are found in clumps called clusters or superclusters. Over the course of the universe's history, individual galaxies have been drawn together by mutual gravitational attraction.

This congregation begins with the formation of galaxy groups, similar to the Local Group, before escalating to the larger structures known as clusters and superclusters. As per the bottom-up model of structure formation, these entities are still in the process of forming, with clusters continuing to attract more galaxies and gas along cosmic filaments.

In some instances, galactic clusters even merge, indicating the dynamic nature of such grand-scale structures. It is important to note that while the chances of galaxies colliding in rich clusters are relatively high, such collisions usually do not result in direct impacts between the stars within them.