The Milky Way 4.8.19.docx - The Milky Way 4/8/19 The milky...

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The Milky Way 4/8/19The milky way is made of gas, dust, and stars. Most of it is located in the disk. There are about100 billion stars. Almost everything we see in the night sky belongs to the milky way.First studies of the galaxy.First attempt to unveil he structure of the galaxy by William Herschel (1785) based onoptical observationsTwo types of clusters of starsoOpen cluster – young clusters of recently formed stars; within the disk of theGalaxyoGlobular clusters – old, centrally concentrated clusters of stars; mostly in a haloaround the galaxyCentered between Sagittarius and Scorpius’s tailDense clusters of 50,000-a million starsOld (~11 billion years), lower-main-sequence starsApprox. 200 globular clusters in our galaxyLocating the center of the milky wayo1917, Harlow Shapley plotted distribution of globular clusters in the milky way inan effort to learn our location within the GalaxyoDistribution is not centered around the suno

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Term
Spring
Professor
Barlow

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