What is a cluster of galaxies?

Answer 1

Galaxy clusters are gravitationally bound system of galaxies with anywhere between 100 galaxies to a 1000 galaxies.

Small-scale distribution of matter in the universe is uneven; it clumps into stars, which group together to form galaxies, and the galaxies themselves clump together to form larger structures.

The following names for the structures correspond to their sizes.

Galaxy groups are collections of a few dozen galaxies or more.

Galaxy Clusters: A grouping of several hundred galaxies together,

Superclusters of galaxies are collections of thousands of galaxies.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Claire Anctil

A cluster of galaxies is a large, gravitationally bound system composed of galaxies, hot gas, and dark matter.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.