On 19 October 2017, astronomer Robert Weryk identified the first confirmed interstellar object ever detected passing through our solar system. Designated 1I/ʻOumuamua, the cigar-shaped visitor had already made its closest approach to Earth before anyone noticed it was there. Its unusual acceleration and elongated form sparked scientific debate and speculation about everything from hydrogen outgassing to artificial origins. Also on 19 October, in the year 2000, researchers announced they had revived a bacterium from a 250-million-year-old salt crystal, raising questions about microbial resilience across geological time. And we look back to October 1596, when the Spanish galleon San Felipe ran aground in Japan. A reported boast from its captain about Spanish colonial methods helped trigger a brutal crackdown on Christianity that would shape Japanese religious policy for centuries. Three stories about unexpected arrivals, ancient survivors, and the moments when small decisions alter the course of history.
