Suppose that humans have created a colony outside of our solar system on a planet called Ariel47. Ariel47 has a mass of 2.25 x 10" kg and a day that lasts 29.3 h (which defines the rotational period of the planet). The colony is located on the planet's equator. D Macmillan Learning The colonists set up a communications satellite which orbits Ariel47. The satellite has a circular orbit that keeps it positioned directly above the colony. Calculate the radius r of the satellite's orbit in kilometers. km