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Astronomy is a natural science that deals with the study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the...

 
Physics (Greek: physis – φύσις meaning "nature") is a natural science that involves the study of matter[1] and its motion through space-time, as well as all applicable concepts, such as energy and...

 
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