The figure below shows scale factor RU as a function of time over the age of the universe.Ignoring the presence of dark energy,which curve would represent a flat universe? 
A) Curve A
B) Curve B
C) Curve C
D) Curve D
Correct Answer:
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Q3: Why does the overall mass and energy
Q19: In the 1990s,astronomers found that distant Type
Q21: The critical density of the universe
Q22: What can simultaneously solve both the flatness
Q22: If
Q23: The figure below shows scale factor RU
Q25: Why would it be very improbable
Q29: Current observations suggest that the density
Q31: The figure below shows scale factor RU
Q32: If the fate of the universe were
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