all objects and structures in the Universe (including galaxy clusters and galaxies) expanding.

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Question 1 The expansion of the Universe can be
understood as
Review Quiz No. 28

1. all objects and structures in the Universe
   (including galaxy clusters and galaxies)
   expanding.
2. all objects and structures in the Universe moving
   through a fixed fabric of space-time.
3. the fabric of space-time expanding, taking all
   objects and structures along with it.
4. the fabric of space-time expanding, while all
   objects and structures (galaxies, clusters, etc.)
   do not take part in this expansion.
5. None of the above.

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Question 2If there was no solution to Olbers
Paradox,

1. the entire night sky would appear as bright as
   the surface of the sun.
2. the entire night sky would appear completely
   black.
3. the entire night sky would appear as bright as
   the surface of the moon.
4. the Universe could not exist.
5. None of the above.

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Question 3The assumption of isotropy states
that, on the largest scales,

1. the Universe should have the same temperature
   everywhere.
2. the Universe should have the exact same
   properties everywhere.
3. the laws of physics should be the same everywhere
   in the Universe.
4. the Universe should appear completely identical
   in every direction that you look.
5. objects should have the same age, no matter from
   what distance you observe them.

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Question 4The surface of a sphere can be
characterized by

1. a positive curvature.
2. a zero curvature.
3. a negative curvature.
4. a double curvature.
5. an infinite curvature.

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