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Black Holes Black Holes The intense gravitational field left when a giant star collapses It is called a black hole because not even light can escape Photon Sphere The outer edge where light bends but is still escapable Event Horizon The point at which no light can escape Singularity The shrunken star too small to be measured but with indefinite density Galaxies Galaxy A large assembly of stars and nebulae Group of Galaxies The Milky Way Our galaxy Flat disk with spiral arms Three Types of Galaxies Elliptical Oval shaped Most common type of galaxy found Contains little gas and dust Most are dim and difficult to see Spiral Dense center with spiral arms Bright and easy to see Contains large amounts of gas and dust – always producing new stars Irregular No specific shape Contains large amounts of gas and dust Small and faint therefore hard to see Quasars Quasars Small, powerful source of energy thought to be cores of distant spiral galaxies They emit radio waves and bright light This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.