What was the temperature of the Universe when the recombination took place that produced the cosmic background radiation we observe today
A) about 2.7 K
B) about 300 K
C) about 3000 K
D) about 3 million K
E) about 3 billion K
Correct Answer:
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Q1: The assumption of isotropy states that
A)the Universe
Q2: In the late 1990's, it was discovered
Q3: The Hubble time is
A)the time it takes
Q4: The assumption of homogeneity states that
A)the Universe
Q5: Dark energy is the name of the
A)force
Q7: The cosmic background radiation comes from a
Q8: If the Universe is closed and finite,
Q9: The resolution of Olbers's paradox suggests that
Q10: As the Universe cooled, it eventually reached
Q11: Space-time will be flat if
A)the Universe is
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