Composition of Solar System

Composition of Solar System, picture from wikipedia

The solar system is a planetary system consisted of star Sun, planets, comets and other objects orbiting around the Sun, and Earth is one of them. The major mass of solar system is from the Sun. The sun is a G2 main-sequence star at the center of solar system which contains about 99.86% of total mass in solar system. The sun generates its heat and light through nuclear fusion. It’s 4.6 billion years old as the rest of the solar system is, and it will continue to last for about 5 billion years.

The next thing in solar system are planets. Mercury is the planet that is closest to sun, followed by Venus, Earth, and Mars. These four planets are called terrestrial planets as they are rocky, small in size with little moons.

Between the terrestrial planets and Jovian planets is the asteroid belt. It’s a Circumstellar disc occupied by numerous asteroids between Mars and Jupiter.

Overview of Kuiper belt, picture from NASA

Jupiter, Saturn, Uranus and Neptune are called Jovian planet which are gaseous, giant, with a lot of moons. Beyond Neptune, it’s the Kuiper belt which is also a Circumstellar disc but it’s much larger in size than asteroid belt — 20 times wider and 20 to 200 times more massive. It’s occupied by asteroids which are remnants from when the solar system formed.


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