Using the Technique of Main-Sequence Fitting to Determine the Distance

question 133

Multiple Choice

Using the technique of main-sequence fitting to determine the distance to a star cluster requires that ________.

• A) we have telescopes powerful enough to allow us to identify the spectral types of main-sequence stars of many masses in the cluster
• B) the cluster be near enough for us to measure the parallax of its stars
• C) we use ultraviolet and X-ray telescopes
• D) we have a well-calibrated period-luminosity relation for Cepheid variable stars

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Definitions:

Fiscal Policy

Government policies regarding taxation and spending that are used to influence economic conditions, including levels of employment, inflation, and economic growth.

Stagflation

An economic condition characterized by stagnant growth, high unemployment, and high inflation.

Potential Output

The maximum amount of goods and services an economy can produce when it utilizes all of its resources efficiently, without causing inflation.

Golden Age

A period of great happiness, prosperity, and achievement, often idealized in historical contexts or specific fields.