17-5 Galaxy Clusters Quiz

What is a galaxy cluster?

• A single galaxy

• A group of stars

• A cluster of over a thousand galaxies

• A community of planets

What is the Local Group?

• A cluster of a few dozen galaxies including the Milky Way

• A single galaxy

• A group of stars

• A cluster of planets

How are rich and poor galaxy clusters defined?

• By wealth

• By the number of galaxies

• By the size of the galaxies

• By the brightness of the galaxies

What is a characteristic of a rich galaxy cluster?

• It is sparsely populated

• It contains only spiral galaxies

• It is crowded at the center with galaxies

• It has no elliptical galaxies

What is a regular cluster?

• A cluster with no specific shape, generally poor, and made of irregular galaxies.

• A cluster that is spherically-shaped, usually rich, and contains many elliptical galaxies.

• A cluster that contains less than a thousand galaxies.

• A cluster that is part of a supercluster.

What is an irregular cluster?

• A cluster that is spherically-shaped and rich.

• A cluster with no specific shape, generally poor, and made of irregular, elliptical, spiral, and barred spiral galaxies.

• A cluster that contains over a thousand galaxies.

• A cluster that is part of a void.

What is a supercluster?

• A single galaxy found in isolation.

• A cluster of clusters of galaxies.

• A cluster with no specific shape.

• A void in space.

What is the Local Group?

• A single galaxy.

• A cluster of a few dozen galaxies including the Milky Way.

• A supercluster.

• A void in space.

What is a void in space?

• A region with a high concentration of galaxies.

• A region between superclusters that is comparatively sparse in cosmic material.

• A cluster of galaxies.

• A single galaxy.

What is the difference between rich and poor galaxy clusters?

• Rich clusters have more galaxies than poor clusters.

• Poor clusters have more galaxies than rich clusters.

• Rich clusters have fewer galaxies than poor clusters.

• Poor clusters have the same number of galaxies as rich clusters.