The Relationship Between a Galaxy and the Galaxy Cluster of Which

question 190

Multiple Choice

The relationship between a galaxy and the galaxy cluster of which it is a part is similar to the relationship between a galaxy cluster and the supercluster of which it is a part, with one important difference. What is that difference?

• A) Clusters contain only like galaxies (spirals, etc.); superclusters combine clusters of various types.
• B) Superclusters rely on copious amounts of dark matter to bind them together; clusters do not.
• C) A cluster is a gravitationally bound system; a supercluster is not.
• D) The galaxy clusters in a supercluster orbit an enormous black hole; this is not the case with the galaxies in a cluster.

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Definitions:

Perched Lake

A body of water situated above the normal water table, created by local, impermeable layers of rock or sediment.

Inflow

The process of water or other fluids moving into a particular area or system, contributing to the volume contained within.

Evaporation

The process by which water is converted from its liquid form to vapor, typically under the influence of sun and heat.

Limestone Aquifer

An underground layer of water-bearing permeable rock, typically limestone, which can store and yield significant quantities of groundwater.