Third Interstellar Comet 3I/ATLAS Stuns Scientists With Surprising Brightening and Blue Glow
Comet 3I/ATLAS, discovered July 1, 2025, in Chile, is the third known interstellar object to enter the solar system. NASA says it poses no threat to Earth, staying at least 240 million km away. At perihelion on Oct. 29, it brightened rapidly and showed an unusual blue color, surprising astronomers. Telescopes worldwide, including Hubble and JWST, are tracking its progress.