Clips labelled as Stephen Hawking's last message began circulating online around 2018, the year of his death, when fans and creators shared short excerpts of his famous computerised voice in tributes. The appeal is not a single viral moment but the voice itself, which for decades represented his public lectures and ideas about the universe. Online, the clip is reused as a respectful closing sound, especially in science, space and motivational edits, because a few seconds of that voice immediately signal curiosity, perseverance and the scale of the cosmos.