3I/ATLAS (C/2025 N1) is the third confirmed interstellar comet, discovered July 1, 2025, by the ATLAS survey in Chile. Traveling on a hyperbolic trajectory with eccentricity >1, it reached perihelion at 1.4 AU on October 30, 2025, and will exit the Solar System. The 10–20 km nucleus shows strong CO₂ and CO outgassing, low water, […]