[CAS AS 105] - Final Exam Guide - Everything you need to know! (48 pages long)
29 Nov 2016
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Document Summary
Aliens: exam 1: authors of articles often infer existence of planet indirectly, based on gravitational in uences we see on other objects, suggest gravity from a large planet clustering the objects, scales in the universe: Star: a large, glowing ball of gas that generates heat and light through nuclear fusion. Planet: a moderately large object that orbits a star; shines by re ected light; may be rocky, icy, or gaseous in composition. Numbers: 8 (maybe 9) planets in the solar system, 200 billion stars in the milky way galaxy, ~50 galaxies in the local group, 100 groups in the virgo supercluster, 1 million superclusters in the observable universe. Physical quantities and scales: mass: measure of the amount of stuff from which an object is made - not the same as weight (grams) 1 kg = 1000 g = 1 l of water. M of sun = 2 x 10^30 kg. M of earth = 6 x 10^24 kg.
