ASTR 113 – 003 Spring 2006 Lecture 09 March 29, 2006 Review (Ch4-5): the Foundation Galaxy (Ch...

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Guiding Questions 1.What is our Galaxy? How do astronomers know where we are located within it? 2.What is the shape and size of our Galaxy? 3.How do we know that our Galaxy has spiral arms? 4.What is most of the Galaxy made of? Is it stars, gas, dust, or something else? 5.What is the nature of the spiral arms? 6.What lies at the very center of our Galaxy?