NASA Discovers a “Sister” Comet of 3I/ATLAS Racing Toward Earth

NASA just spotted what looks like a “sister” comet to 3I/ATLAS racing through our solar system, and the discovery shocked astronomers because both objects seem to come from the same mysterious region of interstellar space. This new comet follows a similar path, moves at incredible speed, and behaves like it was formed under the exact same conditions as ATLAS, which was only the second confirmed interstellar comet ever found. Scientists say its trajectory brings it closer to Earth’s neighborhood than expected, giving us a rare chance to study material that didn’t form in our solar system at all. The strange chemistry, unusual brightness patterns, and odd behavior of both comets hint at secrets about how planets form around other stars.

Credit:
CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/deed.en
Gennady Borisov: by Topp https://commons.wikimedia.org/wiki/File:Gennady_Borisov.jpg
1I/'Oumuamua and 2I/Borisov: by ESO https://commons.wikimedia.org/wiki/File:ESOcast_224.webm
Rubin Oort Cloud and Kuiper Belt Illustration: by RubinObs / NOIRLab / SLAC / NSF / DOE / AURA https://commons.wikimedia.org/wiki/File:Rubin_Oort_Cloud_and_Kuiper_Belt_Illustration_(rubin-Oort-Cloud-and-Kuiper-Belt).jpg
Interstellar objects: by Tony873004 https://commons.wikimedia.org/wiki/File:A_comparison_of_two_interstellar_objects_passing_through_our_solar_system.gif
Comet 3I ATLAS Moon: by Raysastrophotograhy https://commons.wikimedia.org/wiki/File:Comet_3I_ATLAS_Moon_16Nov2025.webm
3I ATLAS animation: by CSS, D. Rankin; Video recorded and edited by User:Renerpho https://commons.wikimedia.org/wiki/File:3I_ATLAS_animation1.webm
Oumuamua: by ESO / M.Kornmesser https://commons.wikimedia.org/wiki/File:Animation_of_artist%27s_concept_of_%60Oumuamua.webm
3I ATLAS animation: by CSS, D. Rankin; Video recorded and edited by User:Renerpho https://commons.wikimedia.org/wiki/File:3I_ATLAS_animation_3.webm
Comet 3I before passing Mars: by Filipp Romanov https://commons.wikimedia.org/wiki/File:Comet_3I_before_passing_Mars.jpg
Interstellar Visitor: by NASA's Scientific Visualization Studio - eMITS / Paul Morris https://commons.wikimedia.org/wiki/File:Interstellar_Visitor_is_Fastest_Comet_Ever_Recorded_(SVS14882_ATLAS_WIDE_MP4).webm
El Viaje de Bennu: by NASA https://commons.wikimedia.org/wiki/File:El_Viaje_de_Bennu.webm
Alien Composition of 2I-Borisov, 1st Interstellar Comet: by NASA https://commons.wikimedia.org/wiki/File:NASA_Reveals_Alien_Composition_of_2I-Borisov,_1st_Interstellar_Comet_NNOb3xrjOhE.webm
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