Fraction of the Universe Understanding types of galaxies (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of http://www.howardedin.com/photos/m96grp.html

Galaxy A galaxy is a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. Galaxies are larger than solar systems. Our Milky Way galaxy is about 100,000 times the size of our solar system. Distances between galaxies are also very large…light years. (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of http://en.wikipedia.org/wiki/Dwarf_galaxy#mediaviewer/File:A_flock_of_stars.jpg

Types of Galaxies Spiral galaxy Barred-spiral galaxy Elliptical galaxy Irregular galaxy Take a moment to discuss these terms with your neighbor. Why do you think these galaxies are given these titles? (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of https://www.flickr.com/photos/nasamarshall/3705124046/

Spiral Galaxy Looks like a pinwheel or satellite image of a hurricane Large bulge in the center and arms that spiral outward arms contain gas, dust, and many bright young stars most new stars form in the arms (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of http://coornio.deviantart.com/art/Galaxy-Spiral-192180270

Barred-Spiral Galaxy Similar to spiral galaxy Just what the name implies Has a bar running through the center Contains a band of bright stars emerging from the center and running across the middle of the entire galaxy (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of http://en.wikipedia.org/wiki/Category:Barred_spiral_galaxies

Elliptical Galaxy Looks like a round or flattened ball Contains billions of stars, but little gas and dust Stars are no longer forming Contain only old stars (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of http://en.wikipedia.org/wiki/Galaxy

Irregular Galaxy Has no specific shape or organization Smaller galaxies Contain young stars and a lot of gas and dust Able to form new stars (C) Copyright 2014- all rights reserved www.cpalms.org image courtesy of http://commons.wikimedia.org/wiki/File:Starburst_in_a_Dwarf_Irregular_Galaxy.jpg

Can you identify galaxies? (C) Copyright 2014- all rights reserved www.cpalms.org images courtesy of https://www.flickr.com/photos/nasamarshall/

(C) Copyright 2014- all rights reserved www.cpalms.org Questions? What are some things that you would like to know about galaxies? Write your question on a post it note and place it on the board. After posting your question, you can take a quick break so that we can regroup. (C) Copyright 2014- all rights reserved www.cpalms.org