Universities Space Research Association
One interesting program, USRA sometimes act as an informal clearing house to broker free satellite launch opportunities for non-profit educational spacecraft. For example, if a launch vehicle company has unused or surplus payload mass available on a scheduled commercial launch, they will sometimes approach USRA to find a payload to fill the gap, otherwise they would have to simply fly ballast.
USRA also acts as a host for the Lunar and Planetary Institute.
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