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heliocentrismsolar systemPtolemaic systemTychonic systemgeocentric modelcometSunKuiper beltasteroidmeteoritemeteor and meteoroidspace weather
Key People

Johannes Kepler
German astronomer

Galileo
Italian philosopher, astronomer and mathematician

Nicolaus Copernicus
Polish astronomer

James Bradley
English astronomer

Georg Joachim Rheticus
Austrian astronomer

Bernard Le Bovier, sieur de Fontenelle
French author and scientist
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