3I/ATLAS (C/2025 N1) is the third confirmed interstellar object in history, discovered in July 2025 by the ATLAS survey. Originating outside our solar system, this nickel-rich comet survived a close perihelion in October 2025, displaying a complex tail structure and unusual blue colouration. Its strange makeup and unusual movement led to widespread theories that it might be artificial, supported by astrophysicist Avi Loeb, but NASA has confirmed that it is a natural object without any signs of technology.