Explain how the nebular theory accounts for the dif- ferences in the composition of the inner planets as compared to the outer planets. 10. On FIGURE 5, prepare a sketch, using circles, to illustrate the locations of the planets Mercury, Venus, Earth, and Mars at their approximate distances from the Sun. Assuming that you are looking down on the Northern Hemisphere of each planet, draw a curved arrow on each planet to illustrate its direction of rota- tion and a straight arrow that shows its direction of revolution around the Sun. SUN 1,00 1.25 0.75 1.50 1.75 0.50 0.25 0 Scale in Astronomical Units (AU) FIGURES Spacing and motion of the terrestrial planets.
