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The top documents tagged [galactic center orbits]
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Szydagis04.13.2015 1 / 14 NASA/STEREO/SDO/GSFC 1. How do we know that the sun is a star (and bonus: when and how did we learn this in history? Note
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Chapter 16 The Milky Way Galaxy 16.1 Overview n How many stars are in the Milky Way? – About 200 billion n How many galaxies are there? – billions
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