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//Mars has a volcano called Olympus Mons- the largest and tallest volcano in the Solar System.It has an orbital period equal to 678// //Earth days and a rotational period equal to 24hrs 37mins and 22.6 seconds.Therefore there are 668 Martian day in a Martian year. Mars has a very eccentric obit that they can vary from 249 million km to 207 million km.As a result,it also experience seasons.// //1 Mars day equals 24.62 Earth hours.The core of Mars is denee and is probamly 3400 KM in diameteer.It is probamly made of motten iron mixed with lots of substance sulfur.// media type="custom" key="9764950"

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