What is a standard candle?
A) an object for which we are likely to know its true luminosity
B) an object for which we can easily measure its apparent brightness
C) a class of objects that we know all have exactly the same luminosity
D) any star for which we know its exact apparent brightness
E) a unit of luminosity used by astronomers
Correct Answer:
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Q1: Which of the following types of galaxies
Q2: Which of the following types of galaxies
Q2: Based on counting the number of galaxies
Q6: What two quantities did Edwin Hubble compare
Q7: Which types of galaxies have a clearly
Q8: How was Edwin Hubble able to use
Q9: Which of the following is true about
Q10: Why are Cepheid variables important?
A) Cepheid variables
Q11: How did Edwin Hubble measure the distance
Q17: Suppose that we look at a photograph
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