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)

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