Space Wiki

Major features of the Solar System (not to scale, from left to right): Pluto, Neptune, Uranus, Saturn, a comet, Jupiter, the asteroid belt, the Sun, Mercury, Venus, Earth & Moon, and Mars. A comet is also seen on the far left.

Solar System is a planetary system consisting of: the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. There are also a few dwarf planets like Ceres, Pluto, Haumea, Makemake, Eris, and Sedna. All of these celestial objects are gravitationally bounded by the Sun's massive gravity.

There are two belts of minor objects in the Solar System, the Asteroid belt and the Kuiper belt. The Asteroid belt is located between Mars and Jupiter and is home thousands of asteroids, which are remaining leftovers from the formation of the Solar System that took place around 4.603 billion years ago.

The inner terrestrial planets Mercury, Venus, Earth, and Mars have a rocky surface composed of rocky and metallic material. They lack a ring system, have very few natural satellites, and other relatively much smaller than their gaseous counterparts. The outer gaseous planets, Jupiter, Saturn, Uranus, and Neptune, have a gaseous or liquid surface composed of hydrogen and helium. The gaseous planets are also classified into two terms: the Gas Giants and the Ice Giants. The Asteroid belt and the Kuiper belt are inhabited by hundreds of dwarf and minor planets. Most of the dwarf planets like Pluto are massive enough to be rounded by their own gravity, but are two small in size to be referred to as normal planets.


80 million years before the Sun formed, two neutron stars collided and caused a mass ejection of various materials into outer space, creating a large interstellar cloud of gas known as the Solar Nebula.

Around 4.603 billion years ago, a shockwave from a nearby supernova that triggered the nebula into an accretion state, where the cloud flattens into a rotating disk of materials. At the center of the accredited nebula, 99.86% of all the materials gathered together to form the Sun. The remaining materials gathered together into a clump of rocky materials that would be the core of Jupiter. The other remaining materials created the rest of the planets and the belts.


The Solar System is located in the Local Interstellar Cloud, which is located in the Local Bubble, which is located in the Orion-Cygnus Arm of the Milky Way Galaxy.

The Solar System is 27,000 light years away from the Milky Way Galaxy's center and goes on an orbital period around the galaxy every 240 million years.