The interstellar object 3I/ATLAS is expected to approach the Sun around October 29 and 30, passing at a distance of roughly 1.4 au (130 million miles or 210 million kilometers), inside Mars' orbit.
Comet 3I/ATLAS was detected on July 1, 2025, by the ATLAS survey telescope in Rio Hurtado, Chile, and is now the most discussed interstellar object among astronomers and scientists.
According to a NASA official from the Center for Near Earth Object Studies (CNEOS), Comet 3I/ATLAS originated outside of our solar system.
Astronomers and scientists are working to study its size and physical properties, making it a significant object of interest.
Author's summary: Comet 3I/ATLAS to pass near Sun soon.