| http://www.w3.org/ns/prov#value | - tem to complete one orbit around the milky way galaxy 230 million years ??? ??? ??? according to Keplers third law jupiter orbits the sun at a faster speed than saturn ??? ??? ??? what do we mean when we say that the universe is expanding average distance between galaxies is increasing with time ??? ??? ??? What is the sun mainly made of hydrogen and helium ??? ??? ??? an astronomical unit (AU) is
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