On September 21, 2003, NASA’s Galileo spacecraft met its deliberate, fiery demise in Jupiter's crushing atmosphere. After 14 years in space and eight years revolutionizing our understanding of the Jovian system, the probe’s propellant was nearly spent. Left to drift, orbital chaos could have eventually sent it careening into Europa, risking forward-contamination of an ocean world capable of harboring life. Instead of risking our first potential encounter with alien biology via hitchhiking Earth microbes, mission controllers triggered an intentional 108,000-mph death dive. Galileo broadcasted radiation data until its final seconds before disintegrating. This sacrificial protocol established a vital ethical precedent for autonomous exploration: when machines venture into the cosmic wilderness, planetary protection demands clean exits, ensuring that future searchers for extraterrestrial life aren't merely discovering the ghosts of our own discarded hardware.