Alien spaceship or comet? NASA shares update on mysterious object racing through the Solar System |

NASA has captured detailed observations of interstellar object 3I/ATLAS, a customer from past our Solar System that has sparked each pleasure and hypothesis. Discovered on 1 July 2025 by the ATLAS survey in Chile, the comet is the third confirmed interstellar object, following 1I/ʻOumuamua (2017) and 2I/Borisov (2019). Moving on a hyperbolic trajectory, 3I/ATLAS entered the interior Solar System at excessive velocity and can go safely, by no means coming nearer than 1.8 AU to Earth. While some commentators, together with astrophysicist Avi Loeb, have speculated it might be an alien spacecraft or nuclear-powered object, NASA and different scientific groups affirm that every one present knowledge point out a pure comet, wealthy in CO₂ and water ice, with a nucleus possible smaller than 1 km.

NASA’s telescopes reveal comet composition

NASA’s James Webb Space Telescope (JWST) used its Near-Infrared Spectrograph (NIRSpec) to analyse the comet’s molecular composition, detecting water ice, carbon monoxide, and unusually excessive ranges of carbon dioxide. These observations, supported by SPHEREx and Hubble Space Telescope knowledge, present the coma and mud tail are generated by pure outgassing fairly than synthetic sources. The excessive CO₂ content material makes the comet unusually brilliant, an element that will have contributed to hypothesis about its “unexplained glow.”

Debunking alien and nuclear claims

While theories about alien spacecraft or nuclear-powered objects have circulated in public commentary, the scientific consensus is obvious: 3I/ATLAS is a pure interstellar comet. Its hyperbolic trajectory, coma formation, and chemical composition match identified processes of icy comets ejected from different star methods. NASA, ESA, and a number of observatories emphasise that no proof helps extraterrestrial or synthetic origins, with ongoing observations centered purely on understanding the comet’s construction, exercise, and insights into planetary formation past our Solar System.