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Describe some of the methods used to determine the
masses of distant galaxies. |
 |
Explain why astronomers think that most of the matter in
the universe is invisible. |
 |
Summarize what is known about the large-scale
distribution of galaxies in the universe. |
 |
Describe some techniques used by astronomers to probe
the universe on large scales. |
 |
Discuss some theories of how galaxies form and evolve. |
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Explain how normal and active galaxies may be related. |
 |
Explain what drives the central engine thought to power
all active galaxies. |
