Question 1

Why do rich clusters of galaxies contain a larger fraction of ellipticals than poor clusters orgroups of galaxies?

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Question 2

The cosmological principle calls for the distribution of galaxies to be homogeneous. On thelarge scale, is this true?

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Question 3

Describe how the radio lobes get to the outside of their galaxy. Where do they come from?How is it that they still exist this far away from their origin? Estimate how much time it mighttake these lobes to travel to their current locations.

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Question 4

Describe how gravitational lensing works. What can it tell us about a quasar? What can it tellus about the galaxy that is doing the lensing? How is lensing valuable to the study of darkmatter?

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Question 5

Explain the significance of the Lyman Alpha Forest in studying the universe on the grandestof scales.

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Question 6

While we know of thousands of quasars, it is likely none of them still exist today. Explain.

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Quiz 25: Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos