AS101 Study Guide - Midterm Guide: Net Force, Lunar Eclipse, Escape Velocity
Document Summary
Lecture 1 to 8 (not 3) ch. Universe is mostly empty space various astronomical objects, gasses, dust and energy within and in between galaxies. Over 100 billion stars in our home galaxy (milky way) 1 light year (distances to stars) = 63 000 au (distances in solar system) (9. 45 trillion km) 1 au = distance between earth to sun (150 million km) smallest to largest: planet (earth) star (sun) solar system galaxy (milky way) formed of billions of stars filament / walls outlining voids (largest) spiral galaxy. Has spiral arms & stars inside of it, but is inside of galaxy clusters & filaments. Astronomers use metric system for calculations star. : a large, glowing ball of gas that generates energy through nuclear fusion. : a moderately large object which orbits a star; it shines by reflected light - may be rocky, icy, or gaseous in composition.
