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Unformatted text preview: Sheet1 Page 1 ASTR 204 Home Some Things to Know for the Midterm Exam: What are Gamma Ray Bursts? How were Gamma Ray Bursts discovered? How was it determined that Gamma Ray Burst's do not lie in the Milky Way's disk? How was it determined that Gamma Ray Burst's are far away? What is a redshift? How do we know that the Universe is expanding? What does the fact that Gamma Ray Bursts are far away imply about the amount of energy that they produce? What is one possible explanation for Gamma Ray Bursts? Can this mechanism explain all Gamma Ray Bursts? What was the Shapley-Curtis Debate about? What positions did Shapley take? What positions did Curtis take? What are Cepheid variables and what is their significance? What arguments did Shapley use to suggest 1) the Sun was far from the Galaxy's center, 2) the Milky Way was larger than pr What arguments did Curtis use to suggest 1) the Sun was at the center of a relatively small Milky Way and 2) the spiral nebula How did Edwin Hubble help to resolve the debate? On which debate points was Shapley correct? On which debate points was Curtis correct? What is the current picture we have about the size and structure of the Milky Way and of the other spiral nebulae? What is the ``K-T Boundary'' and what is its significance? What are foraminifera and what are their significance? What is a dinosaur? What are some of the reasons suggested for the disappearance of the dinosaurs? Why is it so difficult to establish what killed the dinosaurs?...
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