What two quantities did Edwin Hubble compare for a sample of galaxies to discover the expansion of the Universe?
A) velocity and distance
B) luminosity and distance
C) velocity and temperature
D) luminosity and temperature
E) age and distance
Correct Answer:
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Q1: Which of the following types of galaxies
Q2: Based on counting the number of galaxies
Q2: Which of the following types of galaxies
Q3: What is a standard candle?
A) an object
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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