Astro HW #6 - Matthew Yablansky Eitan Reshef Astronomy 120...

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Matthew Yablansky Eitan Reshef Astronomy 120 Homework #6 February 18 th , 2008 Is That My Star Or Yours? As we have learned in class, galaxies are massive gravitationally bound clusters consisting of stars, dust, gas, and dark matter. Each galaxy consists of billions of stars and oftentimes these galaxies can lie right next to each other. So, one of the leading questions that puzzles astronomers today involves the ability to classify which star belongs to which galaxy. There are many intricate techniques that can be used to answer to this question, however, as beginner astronomy students; we have figured the basic methodology necessary for classifying the stars. By simply observing the night sky through a telescope, we can notice a trend of brighter and fainter stars. Typically, the brighter stars indicate that they are closer to us than a fainter star. Through simple triangulation, we can find the distance to these stars and decide whether or not they belong to the Milky Way galaxy or not. We
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