[AST201H1] - Final Exam Guide - Ultimate 239 pages long Study Guide!
29 Nov 2016
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AST201H1 Full Course Notes
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Ast201 - the sun: part 1 (chp 5. 1-5. 4) Can"t for diagonal or across our line of sight) for rotation- faster the object is rotating, the broader the wavelength the spectral lines become. Emission and absorption spectra used to determine the composition of a cloud of gas. Cool star 3000k surface temp emits mostly red light (betelgeuse, antares) Sun 5800k emits in green light but sun looks yellow or white to our eyes bc it also emits other colors throughout the visible spectrum. Hotter stars emit ultraviolet but appear blue-white in color bc our eyes can"t see ultraviolet light. The sun"s diameter is about 100 times earth"s diameter. The sun is about 8 light minutes (150 million km) from earth. Until 1925, people assumed the sun was made of similar material to the earth. In 1925, cecilia payne-gaposchkin showed that in fact, the sun was made mostly of hydrogen, a little helium, and tiny amounts of other elements.
