Details Title: Astronomy Book Vocabulary Description: Chapter 4/Section 4 Total Flash Cards: 11 Created: 12/14/2008 08:18:35		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Astronomy Flashcards
Cards in this set: Term binary star Definition a star system with two stars Term eclipsing binary Definition a binary star system in which one star periodically blocks the light from the other Term open cluster Definition a star cluster that has a loose, disorganized appearance and contains no more than a few thousand stars Term globular cluster Definition a large, round, densely-packed grouping of older stars Term galaxy Definition a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity Term spiral galaxy Definition a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern Term elliptical galaxy Definition a galaxy shaped like a round or flattened ball, generally containing only old stars Term irregular galaxy Definition a galaxy that does not have a regular shape Term quasar Definition an enormously bright, distant galaxy with a giant black hole at its center Term universe Definition all of space and everything in it Term scientific notation Definition a mathematical method of writing numbers using powers of ten