The Milky Way

The Milky Way is the galaxy that contains our Solar System. It is a spiral galaxy and contains between 200.000 and 400.000 million stars, and 100.000 million planets.
The Milky Way has got three parts: the halo, the spiral arms and the galactic center. 
The spiral arms contain a lot of interstellar gas and dust. Our Sun is there, in the Orion Arm.
The galactic center is the Milky Way's center. It consists on millions of old stars.
The halo rounds the galaxy. It has got isolated stars. 
You can see the Milky Way as a band of white light in the sky at night, but it is difficult because there is a lot of contamination.