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- Given that Earth is about 4.6 billion (4.6 x 10%) years old, how many precessional cycles have occurred?calculate the periad T of a planet whose orbit IH} hos a Semimapr axis of 39 AÜ. B) calculate the period Tof a dwarf plantet whose orbit has a Semimajor axis of 228 'AU. c) Determne what the period of rerelution of eartth would be if its dötuine from thesn were 2.5. AU raher than I Au. ASSume that tme moss Of the Sun remains the Same.21) Why doesn't Venus have as many craters as Earth's moon?