Interstellar Comet 3I/ATLAS: Origin, Trajectory and Scientific Stakes In 2025’s Third‑Ever Extrasolar Visitor
Astronomers confirmed a third interstellar object, 3I/ATLAS (C/2025 N1), after imaging by ATLAS on July 1, 2025. The comet, with a nucleus 9–20 km wide and a visible coma, travels at 58 km/s and will reach perihelion on October 30 at 1.4 AU. Models suggest a 66% chance it originated in the Milky Way’s thick disk. Closest approach to Earth will be 1.6 AU.