Return to Unit List Grade 5 Lesson Review   Type your name:   The planets closest to the Sun are called the asteroid beltMilky Wayinner planetsmeteorsSelect your answer. The outer planets lie beyond the universeasteroid beltinner planetsMilky WaySelect your answer. The period of revolutionasteroid beltmeteorsmeteoritesSelect your answer is much slower among the outer planets. Space rocks that burn up before hitting the ground are meteoritesCometsMilky WaymeteorsSelect your answer. Space rocks that reach the ground are called meteorsMilky WayCometsmeteoritesSelect your answer. Cometsmeteorsinner planetsmeteoritesSelect your answer are mixtures of ice, rock, and dust. Our Sun is only one of billions of stars in the asteroid beltMilky Wayinner planetsuniverseSelect your answer. The revolutionuniverseinner planetsMilky WaySelect your answer is made up of billions of star systems similar to the Milky Way.