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Prox-1 installed on Falcon Heavy Prox-1, holding The Planetary Society's LightSail 2 spacecraft, is seen here installed on the payload stack for the U.S. Air Force's STP-2 mission. LightSail 2's P-POD—a small box the size of a loaf of bread—can be seen sticking out the top of Prox-1. SpaceX