SPARK, or Spaceborne Payload Assist Rocket - Kauai, also known as Super Strypi, is an American expendable launch system which is being developed by the University of Hawaii, Sandia and Aerojet Rocketdyne. Designed to place miniaturized satellites into low Earth and sun-synchronous orbits, it is a derivative of the Strypi rocket which was developed in the 1960s in support of nuclear weapons testing.