Giving 50 points for one question PLZ help fast for a test due in 20 min and this is the only one I don't know!
Two planets are orbiting a star. Planet A is closer to the star than Planet B. Which description explains the expected motion of Planets A and B?
Planet B orbits faster than Planet A.
Planet B has a shorter orbital period than Planet A.
Planet A orbits faster than Planet B.
Planet A has an equal orbital period to Planet B.