![](/files/collabspace/1/01/301/10301/images/aad744b8.jpg)
The solar system is composed of all the planets and their satellites as well as other objects which turn around the Sun.
It consists of two classes of planets : The Inner planets (terresterial planets) and The Outer planets (giant planets).
Let us begin with :
The events of our galaxy ...
![](/files/collabspace/1/01/301/10301/images/b710a2fae.jpg)
... The Sun, our star !
![](/files/collabspace/1/01/301/10301/images/b7e3bb6e.jpg)
Now we are going to see both categories of planets compose our Solar System.
I. The Inner Planets
Distance to the Sun |
Near |
Size |
Small |
Composition |
Extern : Solid ; silicates rocks, metal and iron
Intern : Fluid ; core, crust and mantle
|
Temperature (°c) |
more than - 70° |
Density (g.cm p3) |
4 to 5.5
|
In the class of the Inner planets , we have :
![](/files/collabspace/1/01/301/10301/images/ae9c2ff6.jpg)
![](/files/collabspace/1/01/301/10301/images/b1d7b156.jpg)
![](/files/collabspace/1/01/301/10301/images/b4b5d176.jpg)
![](/files/collabspace/1/01/301/10301/images/b81009496.jpg)
![](/files/collabspace/1/01/301/10301/images/ba11f1816.jpg)
Mars seen from the Planet Earth.
On this picture, all photos of the planet Mars are on the same scale, this is the distance Earth-Mars that varies.
Photos taken by : A.R.E.C.A
II. The Outer Planets
Distance to the Sun |
Distant |
Size |
Big |
Composition |
Extern : Gaseous ; Outer layer of gaseous molecular hydrogen, coat of liquid metallic hydrogen
Intern : Fluid ; a pit of rocks and ices
|
Temperature (°c) |
< at - 130° |
Density (g.cm p3) |
~ 1
|
In the Outer planets, we have :
![](/files/collabspace/1/01/301/10301/images/b5109e18e.jpg)
Jupiter seen from Reunion Island on the 12th of February circa17:41 GMT.
![](/files/collabspace/1/01/301/10301/images/b5c51336.jpg)
Saturn seen from the Earth.
Photo taken by : A.R.E.C.A
![](/files/collabspace/1/01/301/10301/images/b2e6f316.jpg)
![](/files/collabspace/1/01/301/10301/images/b3e878b6.jpg)
![](/files/collabspace/1/01/301/10301/images/c01e2d0c.png)
![](/files/collabspace/1/01/301/10301/images/b11134740.JPG)
![](/files/collabspace/1/01/301/10301/images/b21228900.JPG)