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
Correct Answer:
Verified
Correct Answer:
Verified
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