Because of an Obscuring Atmosphere,an Observer in a Distant Galaxy

question 5

Multiple Choice

Because of an obscuring atmosphere,an observer in a distant galaxy can only see the nearest 1,000 stars to his or her home planet.How could the observer most directly determine that he or she lives inside an elliptical galaxy?

• A) by measuring the brightnesses of the stars
• B) by mapping the locations of the stars on the sky
• C) by measuring the differences in velocities between the stars
• D) by measuring the masses of the stars

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Definitions:

Persistent Anxiety

A state of continuous worry and nervousness that may not be related to any specific threat or issue.

Phobic Object

An object or situation that triggers an irrational and intense fear response in an individual.

Autonomic Arousal

The activation of the autonomic nervous system, which regulates involuntary physiological processes, such as heart rate, digestion, respiratory rate, and arousal in response to stress or excitement.

Conversion Disorder

A mental condition where psychological stress is expressed through physical symptoms that have no medical cause.