This morning, at 4.10 Universal Time (UT) on November 8, 2025, the interstellar object 3I/ATLAS showed a complex jet structure. M. Jäger, G. Rhemann and E. Prosperi observed 3I/ATLAS at 29 degrees separation from the Sun in the sky, as reported here.
The stacked images, constituting 24 exposures in the green filter— each lasting 35 seconds , 2 exposures in a red filter and 2 exposures in a blue filter, show a large coma extended out to half a million kilometers (5 arcminutes). The images show at least 7 distinct jets, some of which are anti-tails in the sunward direction.
At the time of observations, the comet was 7–10 degrees above the horizon. Eventually, twilight interfered with the observations, which took place under a bright moonlight.
A picture is worth a thousand words.
ABOUT THE AUTHOR
Avi Loeb is the head of the Galileo Project, founding director of Harvard University’s — Black Hole Initiative, director of the Institute for Theory and Computation at the Harvard-Smithsonian Center for Astrophysics, and the former chair of the astronomy department at Harvard University (2011–2020). He is a former member of the President’s Council of Advisors on Science and Technology and a former chair of the Board on Physics and Astronomy of the National Academies. He is the bestselling author of “Extraterrestrial: The First Sign of Intelligent Life Beyond Earth” and a co-author of the textbook “Life in the Cosmos”, both published in 2021. The paperback edition of his new book, titled “Interstellar”, was published in August 2024.
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