Interesting Facts about the Solar System

Interesting Facts about the Solar SystemThe development was cause by the collapse of a giant molecular cloud, the mass at the centre collecting to make the Sun and a flat disk of dust around it which the planets and other bodies would at some point be formed from.

99.86% of the systemís mass is present in the Sun and the majority of the remaining 0.14% is contained inside the solar systemís eight planets.

The four smaller internal planets, also called the terrestrial planets (Venus, Mercury, Mars and Earth), are primarily made up of rock and metal. The four external planets, also called the gas giants (Saturn, Jupiter, Neptune and Uranus), are substantially larger and more huge than the internal planets.

Solar System Facts for Kids

The Solar System created around 4.6 billion years back.

The solar system includes the Sun and all the objects which orbit around it because of its gravity. Including things for example planets, comets, asteroids, meteoroids and moons.

You can find eight planets in the Solar System. The four internal planets are Mercury, Venus, Earth and Mars while the four external planets are Jupiter, Saturn, Uranus and Neptune.

As of 2008, you can find also five dwarf planets: Pluto, Ceres, Eris, Makemake and Haumea.

The outer planets (also called gas giants) are bigger and made mostly of hydrogen, helium and other gases.

For 1000s of years humans were not aware of the Solar System and thought that Earth was at the middle of the Universe.

There is an asteroid belt which lies between the orbits or Mars and Jupiter, it includes a large number of irregular shaped asteroids.

How Does the Solar System Work

The Sun is the centre of the solar system and celestial bodies including the planets, their moons, the asteroid belt, comets and other things revolve around the Sun and are gravitationally bound to it. The Sun includes around 98% of all the material in the Solar System. 

The boundaries of the solar system's known planets fit in a sphere 50 AU in radius. Beyond that is the Oort Cloud that extends to a length of 100,000 AU. Beyond that is the closest star system is Alpha Centauri.

Note: The stars are not part of the solar system. Astronomers have found that some other stars, besides our own sun, have their own solar systems around them too.


Our Sun is the biggest object in our solar system. It is 4.6 billion years old.


Asteroids are tiny rocky objects orbiting the sun. They range in size from almost 1,000 km (600 miles) across to dust particles. They are so small to be considered planets. Most are present in the Asteroid Belt. Asteroids are also known as planetoids or minor planets.

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