now it,s time for a brief review four kinds of objects orbin the sun. there are planets,sate00lites,asteroids,and comets. all the planets except mercury, venus,and pluto have moons.saturn and uranus have ring systems.planets are classified as either terrrestrial planets or gas giant.asteroids range in size. they have regular orbits. most are found between mars and jupiter. comets have a nucleus. they develop long tails as they approach the sun