An Astronomer Is Observing a Distant Galaxy Which Looks Blue

question 18

Multiple Choice

An astronomer is observing a distant galaxy which looks blue. Which of the following can she conclude from this observation?

• A) the galaxy must be moving toward us (must have a blue shift)
• B) the galaxy must be extremely large (probably a giant elliptical)
• C) the galaxy must have a lot of star formation going on at the time we are seeing it
• D) the galaxy must be rotating very slowly or not at all
• E) the galaxy must contain only older stars (those that formed billions of years ago)

---

Definitions:

Polygraph Test

A type of lie detector test that measures and records several physiological indices such as blood pressure, pulse, and skin conductivity while the subject is asked and answers a series of questions.

Amygdala

The amygdala is a section of the brain that is responsible for detecting fear and preparing for emergency events.

Emotion-Related Information

Data or stimuli that are specifically related to feelings or affective states, which can influence perception, decision-making, and behavior.

Polygraph Tests

A forensic tool designed to detect physiological signs of lying or truthfulness through measures of bodily responses.