Variable stars such as Cepheid variables are used in what important measurement in astronomy?
A) measurement of the distances to stars
B) measurement of the rotation speeds of galaxies
C) measurement of the surface temperatures of stars
D) keeping of accurate time
Correct Answer:
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Q1: Who was the first person to observe
Q3: The famous nineteenth-century observational astronomer Lord Rosse
Q4: In the 1920s Edwin Hubble began answering
Q5: The Milky Way Galaxy
A) is one of
Q6: The idea that some of the nebulae
Q7: The event that settled the Shapley-Curtis debate
Q8: Who won the Shapley-Curtis debate when it
Q9: The first suggestion that there were collections
Q10: The period-luminosity relationship for Cepheid variable stars,
Q11: The famous Shapley-Curtis debate in 1920 concerned
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