Key Takeaways 3I/ATLAS, the third confirmed interstellar object, was discovered on July 1, 2025, following a hyperbolic trajectory not bound to the Sun. Its perihelion on October 30, 2025, and closest Earth approach on December 19, 2025, align closely with three Mercury–Uranus oppositions on October 29, November 19, and December 10, 2025. Observers note a […]