one of two or more sections of a rocket, each section having its own fuel and engine
Sentences:
The solid rocket boosters are part of the first
stage of the space shuttle vehicle.
A rocket gets lighter by dropping each
stage once it runs out of fuel.
More Information:
http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-000043.html →
http://history.nasa.gov/MHR-5/app_f.htm →
http://exploration.grc.nasa.gov/education/rocket/gallery/upper/up1.html →