Which of the Following Statements About Galaxy and Star Formation

question 79

Multiple Choice

Which of the following statements about galaxy and star formation is true?

• A) Star formation follows a "top-down" sequence whereas galaxy formation involves a "bottom-up" sequence.
• B) Dark matter is essential in the formation of galaxies, but it is not involved in the formation of stars.
• C) Galaxy angular momentum originates in gravitational interactions of clumps whereas star angular momentum is caused by the turbulence of the original molecular clouds.
• D) When stars form they acquire most of the mass of the collapsing system, whereas in a Milky Way-like galaxy much of the matter remains distributed in a disk.
• E) All of these statements are true.

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Definitions:

Marginal Propensity

The ratio of the change in an economic variable (such as consumption or saving) in response to a change in another variable (such as income).

Disposable Income

Income remaining for a person to spend or save after all taxes have been paid.

Disposable Income

The amount of money that households have available for spending and saving after income taxes have been taken out.

Consumption Spending

Expenditures by households on goods and services, excluding purchases of new housing, and a major component of GDP.