試題詳解

13. An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution? Knowing that lAU is the average radius of the Earth orbit around the Sun
(A)4 years
(B) 8 years
(C) 16 years
(D)32 years
(E)64 years