AST 1001 Study Guide - Midterm Guide: Angular Distance, Angular Diameter, Depth Perception
Document Summary
Our place in the universe superclusters, galaxy clusters, local group, milky way galaxy, solar system, The average distance between galaxies is expanding over time. This implies that they may have been closer together. Scientists used the observed expansion rate to calculate that the big bang (the point at which expansion began) occurred 14 bill yrs ago. Scaled version of the solar system and galaxy 1/10th billion of actual size. Motions within the galaxy our solar system completes one orbit around the galaxy every 230 million years at a speed of 800,000 kilometers per hour. Galaxies are moving away from us and the more distant the galaxy is the faster it appears to be racing away, we rotate around earth"s axis at more than. Constellations specific region in the sky with well-defined borders (specific familiar patterns and stars merely help us locate them)
