The solar system is composed of the sun at its center and eight planets orbiting around it. The four inner planets, Mercury, Venus, Earth, and Mars, are relatively small, rocky and terrestrial in nature. The four outer planets, Jupiter, Saturn, Uranus, and Neptune, are much larger, made mostly of gas and ice, and are known as the gas giants. Beyond Neptune lies the Kuiper belt, which contains many small, icy objects such as dwarf planets, comets, and asteroids. The Oort Cloud, a vast spherical cloud of icy objects, is believed to be the source of long-period comets that occasionally enter the inner solar system. The sun's gravitational pull dominates the solar system, holding the planets, their moons, and other objects in their orbits around it.
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