The standard bulbs (standard candles) that made it possible for astronomers to discover the acceleration in the expansion of the universe were
A) globular clusters
B) Cepheid variable stars
C) the brightest irregular galaxy in a rich cluster
D) Type Ia supernovae
E) the size of a galaxy dark matter halo
Correct Answer:
Verified
Q4: Recent observations indicate that the universe is
Q5: In our modern view of the expansion
Q6: Which of the following statements about the
Q7: The first scientist to propose a specific
Q8: After the Big Bang, in order for
Q10: The reciprocal of the Hubble constant (1/H)
Q11: Which of the following did NOT happen
Q12: Today, we believe that only a small
Q13: Which of the following is pretty good
Q14: Why did Einstein introduce the cosmological constant
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