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Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Galaxy • A massive system consisting of stars and a medium of gas and dust • Galaxies contain star clusters and multiple star systems • Put in categories base on their shape Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Spiral Galaxy •Has a central bulge of old stars •Has a flat rotating disk of new stars •Has arms •A spherical halo of stars •Has a super massive black hole at the center of the central bulge •We live in the spiral galaxy, the Milky Way The Milky Way Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Elliptical Galaxy •Shaped like a football •Have little gas or dust •Contain mostly old stars Elliptical Galaxy Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Irregular Galaxy •Do not fit into the elliptical or spiral category •Have no definite shape •Frequently the result of when galaxies collide Irregular Galaxy Now take some time… • Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should not highlight everything: • Essential Question: What is a galaxy and how are they classified? Time to use the left hand column • You will now write your own questions using the verbs provided. Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Choose one verb to write your question: Define Describe Explain Galaxy • A massive system consisting of stars and a medium of gas and dust • Galaxies contain star clusters and multiple star systems • Put in categories base on their shape Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Choose one verb to write your question: Define Describe Explain Spiral Galaxy •Has a central bulge of old stars •Has a flat rotating disk of new stars •Has arms •A spherical halo of stars •We live in the spiral galaxy, the Milky Way Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Choose one verb to write your question: Define Describe Explain Elliptical Galaxy •Shaped like a football •Have little gas or dust •Contain mostly old stars Now let’s write a summary Look at each question you wrote on your own, and answer each question in a complete sentence.
