Ever wondered what secrets lie hidden within the swirling dust and ice of interstellar objects? Well, let's dive into the fascinating case of 3I/ATLAS, as observed by the Hubble Space Telescope.
Seventeen images, captured on November 30, December 12, and December 27, 2025, reveal a stunning display of evolving jets emanating from this celestial wanderer.
On a grand scale, extending up to 100,000 kilometers, we see a prominent anti-tail jet, pointing directly towards the Sun. But here's where it gets interesting: zoom in tenfold, and you'll find three distinct jets. One shoots away from the Sun, while the other two splay out sideways, forming angles of roughly 120 degrees relative to each other. The even spacing of these jets, with a consistent 360 degrees divided by 3, is truly intriguing.
So, what's causing this jet dance? The most common explanation ties the jets to pockets of ice on the surface of a rotating nucleus, like a comet. The jet facing the Sun creates the prominent anti-tail. The other jets might be activated by heat seeping through the nucleus.
And this is the part most people miss: The rotation of 3I/ATLAS takes about 16 hours. Jets moving at roughly 0.2 kilometers per second could change their position by 5,000 kilometers in about 8 hours. But how can we explain the stability of the anti-tail jet, which is much larger? The answer might lie in the rotation axis of the object. If it's aligned with the Sun, the anti-tail jet could precess, or wobble, in a small cone, similar to a lighthouse beam.
The anti-tail jet is about 10 times longer than it is wide. This suggests that its misalignment with the rotation axis is smaller than 6 degrees. The required geometric alignment of the rotation axis with the direction of the Sun has a small chance of 0.2% of occurring at random. Is this a sign of advanced technology, or just a beautiful coincidence?
Here's a thought-provoking question: Could the symmetric triple-jet inner structure or the unlikely alignment of the rotation axis with the Sun be evidence of something beyond natural phenomena? Or are we simply witnessing a complex interplay of gas dynamics? What do you think? Share your thoughts in the comments below!
About the Author
Avi Loeb is a prominent figure in the scientific community. He 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.
