January 23 - The Universe Stars and Telescopes...

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The Universe Stars and Telescopes - Electromagnetic Spectrum - Telescopes o Reflecting telescopes—light o Radio telescopes o Satellites  Stars - Sun o Plasma – A 4 th  state of matter  Hot, gas like (stars made out of this)  o Electrons not bond to atom o Hydrogen fuses to helium  o E = mc^2 - Distance and Magnitude o Near state (show parallax – show a relative movement to the stars  around them) Their distance determined by triangulation (a common survey  technique) o How about the rest?  o Magnitude – Apparent vs. absolute Apparent: How bright it appears Absolute: How bright it is  o Cepheid Variables: “yardsticks of the Universe”  Absolute magnitude (luminosity)  varies with their cycle times (their  life) 
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Color and Temperature - Blue   white   yellow   red - Hottest   coldest  The HR Diagram (Hertzprung-Russel) - Plots absolute magnitude (luminosity) against temperature 
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This note was uploaded on 09/09/2009 for the course GEO 301 taught by Professor Long during the Spring '07 term at University of Texas.

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January 23 - The Universe Stars and Telescopes...

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