What is the Hubble time?
A) the time it takes a galaxy moving at 1000 km/sec to move 1 Mpc
B) the time it takes the galaxy to double its distance from us
C) the time remaining before the universe stops expanding and begins to contract
D) an estimate of the age of the universe based on the Hubble constant
Correct Answer:
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Q5: As the universe cooled,it eventually reached a
Q6: What is quintessence?
A)the name of the force
Q7: Under what conditions will space-time be flat?
A)if
Q8: What happens when a proton and an
Q9: Suppose you found a gas cloud,the atoms
Q11: What does the resolution of Olbers' paradox
Q12: What is dark energy?
A)the energy associated with
Q13: What is the assumption of homogeneity?
A)that the
Q14: In 1998,it was announced that the expansion
Q15: Which of the following applies if the
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