Suppose you are using the Doppler method to look for planets around another star. What must you do?
A) Compare many spectra of the star taken over a period of many months or years.
B) Compare many spectra of an orbiting planet taken over a period of many months or years.
C) Compare the brightness of the star over a period of many months or years.
D) Carefully examine a single spectrum of an orbiting planet.
E) Carefully examine a single spectrum of the star.
A) Compare many spectra of the star taken over a period of many months or years.
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