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Stages
 
Delta II rocket's second stage

The Delta II rocket can have two or three stages. Image Credit: NASA

      two or more rockets stacked on top of each other on the same spacecraft. Having more than one rocket can help the spacecraft go higher and carry heavier loads.




Sentences:
The space shuttle used two stages to launch.

The Saturn V spacecraft that took people to the moon had three stages.



More Information:
http://www.nasa.gov/audience/foreducators/rocketry/home/rockets_stack_up.html