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Stages
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