In Determining the Distance to a Galaxy by Using Observations

question 40

Multiple Choice

In determining the distance to a galaxy by using observations of a Cepheid variable star, which of these properties is NOT needed?

• A) average brightness or apparent magnitude of the Cepheid
• B) velocity of the Cepheid via the Doppler effect
• C) type of spectrum of the Cepheid-whether it is metal-rich or metal-poor
• D) period of variability of the Cepheid

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Definitions:

Civilized Behavior

Conduct considered socially appropriate and reflective of societal norms and values, often used historically to justify colonial and cultural dominance.

Rule of Law

The principle that all individuals, institutions, and entities are accountable to laws that are publicly promulgated, equally enforced, and independently adjudicated.

NAFTA

The North American Free Trade Agreement, a treaty between the United States, Canada, and Mexico that created a trilateral trade bloc in North America.

Labor

The body of persons engaged in physical or intellectual work for wages, or the work itself; also, one of the critical factors of production in economics.