An asteroid has a perihelion (the orbit's closest approach to the sun) of 1.5 AU and a period of revolution of 8.0 y. What is its greatest distance from the sun (its aphelion)? A. 8.0 AU B. 6.5 AU C. 4.0 AU D. 2.5 AU E. 3.5 AU F. 4.5 AU G. 5.5 AU 如何将EXC...