Final answer:
Sonny's dedication to building another rocket is fueled by his lifelong passion for space, influenced by popular culture and his personal and professional experiences in space-related projects.
Step-by-step explanation:
Sonny committed himself to building another rocket by drawing inspiration from various sources in his personal and professional life where space and space-related technology played a central role.
With a passion cultivated through Star Wars and Star Trek, and a fondness for space heightened by his personal experiences, including working on a Space Shuttle experiment and building a laser system to detect photons off lunar surface reflectors, Sonny's dedication to space exploration is evident.
His commitment is further exemplified by projects such as the Rosetta mission, which used solar power to match orbits with a comet, and the LightSail-1 mission that afforded CubeSats with the ability to move through space using photon momentum from the Sun's rays.