Why Is It So Difficult to Study the Center of Our

question 35

Multiple Choice

Why is it so difficult to study the center of our galaxy?

• A) Light from the center is lost in the glow of emission nebulae in this direction.
• B) Interstellar dust blocks almost all light before it reaches Earth.
• C) The exact position of the center is not known.
• D) The center of the galaxy puts out very little radiation and is too dim to study.
• E) The center of the galaxy is too far away for radiation to be detected by telescopes.

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Definitions:

Unequal-variances T-test

A statistical test used for comparing the means of two groups that do not have the same variance.

Non-integer Number

A value that is not a whole number, including fractions, decimals, and irrational numbers.

Two-tailed Test

A statistical hypothesis test in which the area of rejection is on both sides of the sampling distribution, allowing for the possibility of an effect in two directions.

Independent Populations

Populations in which the outcomes or characteristics of a sample from one population are not affected by the outcomes or characteristics of a sample from another population.