The motion of an orbiting satellite can be described by the same motion characteristic of any object in uniform circular motion. the centripetal force acting toward the center of the circle, in this case, is supplied by

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?