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Unformatted text preview: Mid-Term 2 Study Guide Electromagnetic Radiation Remember Emission, Reflection, Absorption, Imaging. These were on the last mid- term, but may show up on this one as well. 1) From EM emissions, we can determine a) Luminosity b) Temperature c) Chemical composition d) Speed (Velocity) 2) From EM reflection and absorption, we can determine a) Material and chemical composition 3) From imagery we can determine a) Processes we are too far away to observe directly b) Features 4) From the speed of light, we can determine a) Distances Distances 1) Light as a measuring stick a) Speed of Light = 300,000,000 meters per second (~186,000 miles per) second b) A light year is the distance light travels in one earth year. Make up of the Universe 1) Know the percentages of the stuff that makes up our Solar System a) Gases, Ices, Rocks, Metals GASES METALS ROCKS ICES Composition H, He dominate the composition of the cloud Iron, Nickel Silicates, Oxides Water, Methane, Ammonia % of Total Mass In Nebula ~98.6% of total cloud mass (~0.08% of the cloud mass: less than one tenth of a percent ~0.22% of the cloud mass 1.1% cloud mass % of Total Mass In DUST 5% of the DUST composition in the cloud mass 15% of the DUST composition in the cloud mass 80% composition of dust in the cloud mass Understand where these were situated in the early, pre-stellar, solar system.Understand where these were situated in the early, pre-stellar, solar system....
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- Spring '08