What Scientific Method Is Used to Observe the Pulsation in Size

question 20

Multiple Choice

What scientific method is used to observe the pulsation in size of a Cepheid variable star?

• A) This behavior has only been predicted theoretically; it has never been detected.
• B) observed perturbations in the orbits of planets around the star
• C) observed increase and decrease in the size of the star's image
• D) Doppler shift of absorption lines in the star's spectrum

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