Tag Archive | 3I/ATLAS

SPACEWEATHER: 3I/ATLAS Brightening, and Strong Activity on the Farside

3I/ATLAS Made it Beyond a Blast on the Farside

SPACEWEATHER.COM NEWS: 10/30/2025

RAPID BRIGHTENING OF COMET 3I/ATLAS: Spacecraft monitoring the sun witnessed a dramatic surge in the brightness of Comet 3I/ATLAS as it plunged toward its Oct. 29th perihelion. Qicheng Zhang (Lowell Observatory) and Karl Battams (U.S. Naval Research Laboratory) reported the phenomenon in a preprint submitted to the Astrophysical Journal Letters on Oct. 28th.

“The reason for 3I’s rapid brightening, which far exceeds the brightening rate of most Oort cloud comets, remains unclear,” the authors say.

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