Apr13A - MILKY WAY GALAXY ISLAND UNIVERSES What is...

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MILKY WAY GALAXY ISLAND UNIVERSES? What is structure of the Milky Way? Galileo: It is made of many scattered stars Copernican Principle: We are not at the center of anything 1780-to-1920: Milky Way is roughly disk shaped What are the spiral nebulae? If separate star systems, then the huge distances are ‘unthinkable’ Nebulous; i.e. no stars resolved Made up of gases? So far away with so many stars that they blur together? SN 1885 in the Andromeda Nebula If ordinary nova, then the distance would put Andromeda in our Milky Way Van Maanen: The Andromeda Nebula rotates We now know that this was simply an erroneous measurement The ‘Great Debate’ of 1920: “Are the spiral nebulae ‘island universes’ outside our Milky Way? Heber Curtis: Yes, our Milky Way is just one of many ‘island universes’ Harlow Shapley: No, everything is in our Milky Way The solution can come only with decisive evidence, not by debatesmanship or opinions
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This note was uploaded on 02/25/2011 for the course ASTR 1102 taught by Professor Staff during the Spring '08 term at LSU.

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Apr13A - MILKY WAY GALAXY ISLAND UNIVERSES What is...

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