The film's narrative builds toward the high-stakes National Science Fair in Indianapolis. A major setback occurs when Homer's prized rocket nozzle components are stolen at the fair. In a moment of desperate ingenuity, Homer calls home, and his mother Elsie finally stands up to his father, John, threatening to leave him if he doesn't help their son. John relents, leveraging his authority to have the mine's machine shop quickly manufacture replacement parts and ship them via bus to Homer.
Homer wins the top prize and is offered a college scholarship, successfully securing his ticket out of Coalwood. However, the emotional climax is reserved for his return home. The Rocket Boys prepare to launch their final and largest rocket, named 'Miss Riley' in honor of their beloved teacher who is dying of Hodgkin's disease.
In the final sequence, John Hickam finally attends a launch. As Homer prepares to push the ignition button, he offers the honor to his father. John declines but places a supportive hand on Homer's shoulder—a silent, powerful gesture of acceptance and pride. The rocket soars flawlessly into the sky. The epilogue reveals that all the boys graduated college, Homer became a NASA engineer, and John passed away years later from black lung disease, completing the poignant thematic arc of sacrifice and generational progress.