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Stage
 
Ares 1 separated into parts

In the future, Ares I will take Orion and its crew to the International Space Station. Image Credit: NASA

      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   →