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NASA confirms 3I/Atlas, a comet from another star system, passed through our solar system in late 2025, captured by multiple space telescopes.
NASA has released close-up images of 3I/Atlas, the third confirmed interstellar comet to pass through our solar system, discovered in summer 2025.
The comet, estimated 1,444 feet to 3.5 miles wide, made a close approach to Mars in November 2025, passing within 18 million miles, and is now moving away after its closest point to Earth—about 167 million miles—in mid-December.
Multiple NASA and ESA spacecraft, including the James Webb Space Telescope and the Juice mission, captured data and images during the flyby.
The comet, visible in the predawn sky with binoculars, is believed to have formed before our solar system and offers rare insight into material from another star system.
NASA confirmed it is a natural comet, dismissing alien spacecraft speculation, though delayed responses to public inquiries followed a government shutdown.
La NASA confirma 3I/Atlas, un cometa de otro sistema estelar, pasó a través de nuestro sistema solar a finales de 2025, capturado por varios telescopios espaciales.