Astronomy Notes

Astronomy Notes - ASTR 1220 Introduction to Stars Galaxies...

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Unformatted text preview: ASTR 1220 : Introduction to Stars, Galaxies and the Universe Whittle, Section 4, class # M,W 2:00 - 3:15 Clark 107 Text: The Cosmic Perspective (Bennett et a1. 5til ed). Major cosmic structures Stars: huge balls of glowing gas that create heat & light by nuclear fusion. Planets: relatively large objects that orbits a star. They shine by reflected light. Can be rocky, icy, liquid, or gas. ‘ Moons: Object that orbits a planet Earth Moon The Big Picture Introduce the various cosmic structures: atoms, planets, stars, galaxies, Universe their relative scales their relative motions their evolution, including how we fit in (also review use of poWers of 10) Solar istarl systems: a star and all the material that orbits it, including planets and moons. Nebulae: Clouds ofgas and dust , that exist between the stars. glories: Enormous collections of stars (and gas) gathered by gravity and orbiting a common center. The Galaxy Web: The web-like pattern of galaxies filling space The Visible Universe: All matter and energy out to our 14 billion light year visible limit. The Universe: A possibly infinite region outside our visible Universe. Review of our place in the Universe ...
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