Earth's atmosphere has 7 layers. The lowest layer is called troposphere. Rain, snow and wind only take place in the troposphere. There is an upper atmosphere. There is a lower atmosphere. A rocket travels through the 7 layers of the atmosphere. Then the rocket goes into space.

Explore Space ... Not Drugs!
Hear what astronauts have to say about staying drug-free.
Last modified: Tue May 19 11:05:45 PDT 1998