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|dark matter ||galactic cannibalism ||Hubble Law
|poor cluster ||rich cluster ||rotation curve
|starburst galaxy ||supercluster ||velocity dispersion
- Why must the distance to a galaxy be known first before you can
measure such basic properties of the galaxy such as its luminosity, mass,
- What are the various ways you can find distances to the galaxies?
- What do you find when you plot the redshifts of the galaxies vs. their
distance from us? How does the speed of most galaxies vary with increasing
distance from our galaxy?
- How does the Hubble Law show that the universe is expanding?
- How does the Hubble Law show that all of the galaxies are moving
away from each other and that astronomers in every galaxy will see the same
- How can you measure the masses of galaxies?
- What is it about the motions of the stars in galaxies that indicates
a large amount of dark matter is present?
- What is a cluster of galaxies? Are we in one? What is the nearest large
cluster of galaxies to us?
- Why are collisions of galaxies much more common than collisions of stars?
- How are spiral galaxies formed?
- What two ways are there to create an elliptical galaxy?
- What kind of galaxy is typically found near the
center of a large cluster of galaxies? Why is that kind of galaxy so big?
- Why is the spatial distribution of clusters of galaxies sometimes
described as a foamy structure or like edges of soap bubbles? How do we know
that the clusters have this spatial distribution?
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last updated: 25 May 2001
Is this page a copy of Strobel's
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