THE SOLAR SYSTEM.
The Solar system is the Sun and all the objects that
orbit around it. The sun is orbited by planets, asteroids,
comets and other things.
The solar system is about 4.6 Billion years old it formed
by gravity in a large molecular cloud. Most of it metter
geterad in the center, and the rest flattend into a orbiting
disk that become the solar system. It is tought that almost
all stars form by this process.
The Sun is a star it contains 99.9% of the Solar system's mass. This means that
gravity. The other objects are pulled into orbit around the Sun. The Sun is
mostly made out of hydrogen, and some helium.
There are eight planets in the Solar system from closest to the farthest from the
Sun, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
The first four planets are called terrestrial planets. They are mostly made of
rocks and metal, and they are mostly solid. The last four planets are called
gas giants. This is because they are much larger then other planets and are
mostly made of gas.
The Solar system also contains other things. There are asteroids belts, mostly
between Mars and Jupiter. Further out then Neptune there is the kuper belt
and the scattered disk. These areas have dwarf planets, including Pluto,
MakeMake and Eris. There are thousands of very small objects in these areas.
There are also comets, centaurs, and there is interplanetary.
Six of the planets and three of the dwarf planets are orbited by moons. Further
more, planetary dust orbits the gas giants. Many other systems like the Solar
system have been found. Each of the billions of stars in the Milkyway galaxy
might have applantery system.