Payload assist module

What is Payload assist module?

Payload assist module definition and meaning on Dictionary terms:
noun
a U.S. solid-propellant rocket used to boost a medium-weight spacecraft from a circular low-earth orbit to an elliptical transfer orbit for later insertion into a geosynchronous orbit. Abbreviation: PAM

 

reference: https://www.dictionary.com/browse/payload-assist-module

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