Sections Review
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Vocabulary
cosmological principle  cosmology  homogeneous 
Hubble constant  Hubble law  isotropic 
Olbers' Paradox  perfect cosmological principle 

 What are the assumptions that Olber's Paradox is based on?
 Why is the night sky dark? What important
conclusions can you draw from the simple observation that the night sky is dark?
 Will an object with a large redshift be far away or close?
 What can the Hubble constant constant (H_{o})
tell you about the age of the universe? How would the derived age of the universe
change if H_{o} was 50
km/sec Mpc^{1} instead of 100 km/sec Mpc^{1}?
 Is the Hubble constant actually constant throughout time? Why or why not?
 What would the relation between the radial velocity and distance be if
there was no expansion? What would the relation be if the universe was
contracting?
 Is there a center to the expansion in normal threedimensional space? Why
or why not?
 Why is an analogy like flat houses on an expanding balloon used to
try to picture the expansion?
 Is the space between stars inside a galaxy expanding? Why or why
not? Is the space between the molecules in your body expanding with the
universe? Why or why not?
 How is looking at faraway objects equivalent to looking back in time?
 What is the cosmological principle? What is the perfect cosmological
principle? Which one can an evolving universe fit in? Why?
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last updated: 26 May 2001
Is this page a copy of Strobel's
Astronomy Notes?
Author of original content:
Nick Strobel