Organization of the universe

Class: 3
Date: February; Wednesday 24/10
Item:
Organization of the universe
The human being althoug much studied still unknow about the universe; nevertheless been able to identify some components like:
The galaxies
There are groups of a millions of stars, celestials bodies and interstellar matter.
The galaxies have a very long life, beginning whit an irregular galaxie of mass, dust and cosmic gas that rotate constantly to form a barred spiral; the arms follow approaching the middle; the rotation continues and the galaxie end in a spheroid called elliptical galaxie; in this moment is a old galaxie and have thousand of millions years old.