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What is the sum of 36 and 12
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(Astronomy) Different Solar systems...? what are some difference between the model of the solar system developed by Kepler and that of Copernicus?? and how are they radically different that the model of Claudius Ptolemy? **I just needa get some ideas from what you tell me so I can write an essay, and if you could provide some links too**
(Astronomy) Different Solar systems...?
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