What Observed Property of the Milky Way Suggests That It

question 19

Multiple Choice

What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars?

• A) the rotation curve
• B) the velocities of the open star clusters
• C) the number and shape of the spiral arms
• D) the thickness of the disk
• E) the presence of a black hole at the galactic center

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Definitions:

Marginal Utility

The supplementary enjoyment or value derived from the use of one more unit of a good or service.

Hypothetical Consumer

A theoretical representation of an average or typical consumer used in economic models to predict the behavior of consumers under different market conditions.

Total Utility

The total enjoyment gained from the use of a particular cumulative amount of a product or service.

Average Cost Curve

A graphical representation showing how the average cost of production changes as the quantity of output is increased.