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Transcript of Galaxies
Gallaway Period 4 Types, Similarities, and Differences 3 Main Types of Galaxies Spiral Galaxy Elliptical Galaxy Irregular Galaxy Spiral Galaxies Made of stars, dust, and gas. Stars, gas and dust are located in the Spiral Arms of the galaxy. Spiral Arms begin at the Central Disk or Bulge Some of the spiral arms are short and stubby, while others are thicker and longer. The galaxy is thicker near the center, the Central Bulge Elliptical Galaxies Elliptical Galaxies have no internal structure. There is a spherical Halo of Globular Clusters and old red stars around the disk. Elliptical Galaxies are usually spherical or football-shaped. Irregular Galaxies Elliptical Galaxies tend to contain a higher percentage of old stars than Spiral Galaxies. Elliptical Galaxies contain little to no gas and dust Vocabulary Spiral Galaxy - A type of galaxy made of stars, gas, and dust. Spiral Galaxies begin at a central bulge and have spiral arms that stretch out from there. Irregular Galaxies are oddly shaped. Many form from the gravitational pull of other galaxies. Contain many young stars, not very many old ones. Irregular Galaxies contain certain areas of intense star formation. Elliptical Galaxy - A type of galaxy that does not contain an internal structure, normally shaped like a sphere or football with higher percentages of old stars. Vocabulary to learn will be in this color font and will be reviewed at the end of the lesson. Bibliography "Active galactic nuclei." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. 4th ed. Vol. 1. Detroit: Gale, 2008. 38-39. Gale Virtual Reference Library. Web. 13 Dec. 2012.
Aguilar, David A. Planets, Stars, and Galaxies. Illus. David A. Aguilar. N.p.: National Geographic, n.d. Print.
Bond, Peter. DK Guide to Space; A Photogrphic Journey through the Universe. New York: DK, 1999. Print.
Croswell, Ken. "Galactic Pride: In Praise of the Milky Way." Sky and Telescope: n. pag. Print.
Dickinson, Terence. The Universe and beyond. 3rd ed. Willowdale: Firefly, 1999. Print.
Earth & Space: IScience. Columbus: McGraw, 2012. Print.
"Galaxy." UXL Encyclopedia of Science. Ed. Rob Nagel. 2nd ed. Vol. 5. Detroit: UXL, 2002. 941-945. Gale Virtual Reference Library. Web. 13 Dec. 2012.
Heckert, Paul A. "Galaxy." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. 4th ed. Vol. 3. Detroit: Gale, 2008. 1844-1849. Gale Virtual Reference Library. Web. 13 Dec. 2012."Milky Way." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. 4th ed. Vol. 4. Detroit: Gale, 2008. 2768-2772. Gale Virtual Reference Library. Web. 13 Dec. 2012. Thanks for Watching! "Starburst Galaxy." UXL Encyclopedia of Science. Ed. Rob Nagel. 2nd ed. Vol. 9. Detroit: UXL, 2002. 1806-1808. Gale Virtual Reference Library. Web. 13 Dec. 2012. Other Types of Galaxies Starburst Galaxies Peculiar Galaxies Lenticular Galaxies Irregular Galaxies - Oddly shaped galaxies that contain many young stars and form from the gravitational pull of other galaxies. Globular Clusters - Clusters of stars that orbit around the center of the galaxy. Spiral
Galaxy Central Bulge - The center of the galaxy, a black hole surrounded by clusters of old stars. Irregular Galaxy The Milky Way Galaxy is a Spiral Galaxy! Fun Facts and fun comments will look like this! Less Important! The NGC 1427A Galaxy is an Irregular Galaxy! Things to Remember The three main types of galaxies: Spiral, Elliptical, and Irregular. Things to Remember That the NGC 1427A Galaxy is an Irregular Galaxy The Milky Way Galaxy is a Spiral Galaxy Elliptical galaxies are shaped like footballs or spheres.