Chapter 34 Review

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Key Concept Summary

TA Summary


A constant introduced by Einstein into his equations in an attempt to cancel the predictions of an expanding Universe.
The galaxy of over a hundred billion solar masses to which our Sun belongs.
Star system with an elliptical shape.
A non-symmetric galaxy that does not have a well-defined shape.
A simple relation where the actual brightness of stars can be determined by observing the pulsation period of a star.
Elliptical galaxy that contains over a trillion stars and has a mass much greater than the Milky Way.
A group of galaxies that is gravitationally bound together.
An observed relation between the recessional velocity of a galaxy and the distance to that galaxy.
Galaxy where the spiral arm pattern originates from a bar of material that passes through the nucleus of the galaxy.
A galaxy flattened into a disk shape with a pattern of spiral arms wound about a central nucleus.
A group consisting of clusters of clusters of galaxies.
A small group of about two dozen galaxies that is associated with our Milky Way.
A cosmological model that indicates that our Universe had a hot beginning when first created.
Part of the Hubble Law that gives the rate at which our Universe is expanding.


It appears that the expansion rate of the universe is increasing with time.
Spiral galaxies are the most common type of galaxy


Which statement is true about the Big Bang model?
New data about the expansion of the Universe indicates that the majority of galaxies are
When the spectrum of light from distant galaxies is measured, what is found?
Which of the following causes some to speculate that our Universe included an era when all matter had a temperature at least as hot as the core of our Sun?
Two Cepheid Variable Stars, A and B, are seen in two different clusters. The absolute brightness of Cepheid variable stars can be determined by measuring how rapidly they change in brightness. Stars with longer periods produce more light. Star B has a longer pulsation period and appears about as bright as Star A. Which of the following is true?
Which statement is true in the Big Bang model?
The distance to the nearest few thousand stars can be determined by which of the following methods?
What would be the best method to determine the distance to a distant star about 100,000 light years away in our own galaxy?
Observations of galaxies outside own our local group of galaxies indicates that the universe is
A redshift in the spectrum of a galaxy indicates that the galaxy is
When the absorption spectrum of light from distant galaxies is measured, what is found?
When measuring the positions of the lines in the absorption spectrum of stars in a certain galaxy, the lines are all shifted toward the blue end of the spectrum. This means:
Spiral galaxies typically contain large numbers of blue stars and bright nebulae, while elliptical galaxies typically contain mostly yellow and red stars. What can you conclude based on this information?

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