Suppose a comet had a very eccentric orbit that brought it quite close to the Sun at closest approach and beyond Mars when farthest from the Sun, but with an average orbital distance of 1 AU. How long would it take to complete an orbit and where would it spend most of its time?

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle