Our solar system consists of the Sun and everything that orbits it, including 8 planets, over 100 moons, asteroids, comets, and other small bodies. The inner planets closest to the Sun are Mercury, Venus, Earth, and Mars. The outer planets are gas giants Jupiter, Saturn, Uranus, and Neptune. Pluto is the farthest known and smallest planet. Asteroids are rocky remnants left over from the early solar system's formation while comets are icy small bodies that release gases and dust when passing near the Sun.