What Useful Purpose Did RR Lyrae Stars Serve for Harlow

question 62

Multiple Choice

What useful purpose did RR Lyrae stars serve for Harlow Shapley in locating the galactic center?

• A) Their brightness variations allowed accurate distances to be measured.
• B) They emit copious amounts of infrared radiation and are thus visible through interstellar dust,which obscured visible light.
• C) They are concentrated in the galactic center and so defined its direction.
• D) They are important spiral arm tracers and thus defined the shape of the Galaxy.

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