Guidance Sheet #2 - for Quiz #2 on 07/18/96

1. How do we know that dark matter exists?
2. How much dark matter exists?
3. What might the dark matter consist of?

1. What is our best estimate as to whether the Universe is open or closed?

1. How do matter and radiation interact during the first 100 seconds after the Big Bang?
2. How do we know anything about the first 100 seconds?

1. Which elements were "assembled" in the first ~ 3 minutes?
2. Why were heavier elements not produced?

1. What are the properties of the cosmic microwave background radiation (CMBR)?
2. What is the "era of recombination"?
3. How is the "era of recombination" related to the CMBR?

1. How does the Universe change from an extremely homogeneous medium (even on small scales) to a medium with structure (i.e., lumpiness)

1. How do galaxies form?
2. Do all the stars form at the same time in a galaxy?

1. Which elements are made in the interiors of stars?
2. Are the same elements made in all stars?

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