There are two main types of planets in our solar system: terrestrial and gas giants. Terrestrial planets, like Earth, Mars, and Venus, are rocky and have solid surfaces. They are closer to the Sun and are smaller in size. These planets often have features like mountains, valleys, and craters. On the other hand, gas giants, such as Jupiter and Saturn, are much larger and made mostly of gases like hydrogen and helium. They do not have solid surfaces and have thick atmospheres. Some gas giants also have beautiful rings and many moons, making them fascinating to study in our universe.