1_-_Introduction - Preview 1 - Introduction Astro 3332 105...

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1 - Introduction Astro 3332 105 Space Sciences by Jim Houck and ??Grader?? 2 Preview Objectives Expectations Website: http://coursewiki.astro.cornell.edu/Astro332 Text: Astronomy in a Nutshell by Dan Maoz Homework and Exams Physics, Astronomy, and Engineering Light is our main source of Information Wavelength Intensity Resolution, etc. 3 Objectives: • Use basic physics to understand stars, galaxies and the Universe. • Forces of nature: – Gravity – Strong – Weak • Gravity is the weakest but it dominates in almost all astrophysical cases. 4 Aproximations We can understand many complex things without using a lot of complex analysis. What is the cost of a nuclear submarine? How many piano tuners live in Ithaca? How many gas stations are there Chicago? We seldom get answers to within 1% so we shouldn’t use fancy mathematics. sin( θ ) ~ θ and cos( θ ) ~1 if θ is ‘small’ If θ ~0.1 (radians) then we shouldn’t write sin( θ ) = 0.099833 but rather sin( θ )~0.1
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1_-_Introduction - Preview 1 - Introduction Astro 3332 105...

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