What is a Cepheid variable star?
A) one of several classes of stars that pulsate randomly in brightness
B) low-mass, horizontal-branch star that pulsates regularly in brightness
C) star that normally remains constant in brightness but occasionally flares up in brightness by several magnitudes
D) high-mass star that pulsates regularly in brightness
Correct Answer:
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Q272: What physical mechanism is responsible for the
Q273: What is the difference between a
Q274: What characteristic of Cepheid variables makes them
Q275: What scientific method is used to observe
Q276: Suppose a Cepheid oscillates from an initial
Q278: What are the stars in the lower
Q279: Cepheid stars are
A) giant stars that pulsate
Q280: A Cepheid variable is a
A) type of
Q281: Which of these statements about a globular
Q282: The period of variability of a Cepheid
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