Objective 04/12/2013 Identify three types of galaxies. Intro

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Objective 04/12/2013 Identify three types of galaxies. Intro Do all galaxies come in the same shape or size as our galaxy? DO NOW Check and Hand in Missing Assignments Take out Weekly WS #30 & Agenda

Galaxies

galaxy a collection of stars, dust, and gas held together by gravity Can contain billions of stars There are billions of galaxies in the universe

have a bulge at the center and spiral arms. Spiral Galaxies have a bulge at the center and spiral arms. The Milky Way

Elliptical Galaxies A massive blob of stars Very bright centers but little dust and gas

Irregular Galaxies Galaxies that don’t fit into any other class “leftovers”

Contents of Galaxies Stars Nebulae Star clusters What’s in a galaxy? Planets Nebulae Star clusters

Objective: 12 April 2013 Identify three types of galaxies. Outro Where are we located in our galaxy?