Interstellar Visitor 3I/ATLAS: A Star-Borne Comet Tracks Through Our Solar System
In July 2025, the ATLAS sky survey in Chile detected a faint, fast-moving object with a hyperbolic (unbound) orbit, later identified as 3I/ATLAS, the third confirmed interstellar object. Traveling about 130,000 mph, it was not a threat to Earth, with a close approach well outside the Moon’s orbit. Hubble and other facilities observed a dust plume and activity consistent with a comet, constraining the nucleus size and confirming a cometary nature. The discovery shows interstellar visitors are real and detectable with modern surveys, enabling comparative studies of material from other star systems.