Our Solar System
The Solar System is comprised of the Sun, and its planetary system of eight planets, their moons, and other non-stellar objects. The Solar System formed 4.6 billion years ago, at its center and containing the majority of the Solar System's mass is our Sun. The four smaller inner planets, Mercury, Venus, Earth and Mars, also called terrestrial planets, are primarily composed of rocks and metal. The four outer planets, Jupiter, Saturn, Uranus and Neptune, called the gas giants are much more massive.
The Solar System also contains a number of smaller objects. The asteroid belt, which lies between Mars and Jupiter, is composed of small rocky asteroids. Beyond Neptune lies the Kuiper belt, in the Kuiper belt you will find our dwarf planets including Pluto, Eris, Haumea, and Makemake. Many other small objects exist in the Solar System including moons, comets, meteors, and asteroids.