3I/ATLAS Anomaly: Jets Not Smeared by Rotation - Alien Spacecraft Clue? (2025)

The 12th Mystery of 3I/ATLAS: Why Its Jets Defy Rotation

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Imagine a cosmic object spinning rapidly, yet its jets remain perfectly aligned, as if frozen in time. This is the latest enigma surrounding 3I/ATLAS, an interstellar visitor that continues to baffle astronomers. Back in July and August 2025, observations suggested that 3I/ATLAS rotates every 16.16 (±0.01) hours (as detailed in this study). But here’s where it gets mind-boggling: recent images reveal a network of tightly collimated jets extending over a million kilometers, seemingly unaffected by this rapid rotation. How is this possible? Let’s dive in.

The Jets That Shouldn’t Exist

Last week, preliminary images captured by F. Niebling and M. Buechner (view here) showcased these jets, which defy conventional understanding. If 3I/ATLAS is spinning every 16.16 hours, the jets should smear out, like water from a spinning sprinkler. Instead, they remain sharply focused, stretching over distances where material would take nearly a month to travel at the expected speed of 400 meters per second. This raises a critical question: What’s holding these jets in place?

Possible Explanations—Or Are They?

1. Slowed Rotation? Unlikely. Outgassing typically speeds up rotation, not slows it down (source).
2. Sun-Induced Outgassing? Perhaps the Sun’s illumination triggers outgassing only at specific angles, tied to the object’s surface features. For instance, ice in shadowed valleys might sublimate only when the Sun hits just right, creating pulsating jets. But this theory struggles to explain jets pointing away from the Sun, as seen in this image by M. Jäger, G. Rhemann, and E. Prosperi.
3. Fragment Trails? The jets could be the evaporated remnants of fragments ejected from the nucleus, suggesting a breakup near the Sun. However, images by D. Jewitt and J. Luu (see here) indicate 3I/ATLAS remains intact.
4. Technological Thrusters? A more speculative idea is that these jets are powered by advanced technology, maintaining orientation for navigation. But is this too far-fetched, or could it explain the unexplainable?

The Growing List of 3I/ATLAS Anomalies

This jet mystery adds to an already long list of peculiarities about 3I/ATLAS. Here’s a breakdown of the 12 anomalies:

1. Retrograde Trajectory: Its path aligns suspiciously close to the ecliptic plane (0.2% likelihood).
2. Sunward Jet: Unlike typical comets, it displays a persistent anti-tail (details here).
3. Massive Yet Fast: It’s far more massive than other interstellar objects like ‘Oumuamua and Borisov, yet moves faster (<0.1% likelihood).
4. Precise Timing: Its arrival brought it close to Mars, Venus, and Jupiter, yet it was unobservable from Earth at perihelion (0.005% likelihood).
5. Unusual Composition: Its gas plume contains high nickel levels, unlike any known comet (<1% likelihood).
6. Low Water Content: Only 4% of its mass is water, atypical for comets.
7. Extreme Polarization: It exhibits negative polarization never seen in comets (<1% likelihood).
8. Wow! Signal Connection: It arrived from a direction near the famous radio signal (0.6% likelihood).
9. Rapid Brightening: Near the Sun, it brightened faster and appeared bluer than any known comet.
10. Impossible Jets: Its sunward and anti-solar jets require an unrealistically large surface area to sustain.
11. Non-Gravitational Acceleration: It lost at least 13% of its mass near perihelion, yet remained intact.
12. Collimated Jets: These jets maintain orientation despite rotation, as discussed.

What’s Next? The Loeb Scale Awaits

As new data pours in, the Loeb Scale—a measure of an object’s potential artificial origin—hangs in the balance. If the jets’ speed and composition align with natural comet behavior, the scale will drop. But if they defy natural explanations, the scale could soar, especially if evidence of related objects near Earth or Mars emerges. Could 3I/ATLAS be more than just a cosmic oddity?

About the Author

Avi Loeb, head of the Galileo Project and bestselling author of Extraterrestrial and Interstellar, continues to push the boundaries of our understanding of the universe. His work challenges us to consider the possibilities beyond the conventional.

Your Turn: What Do You Think?

Are these anomalies natural phenomena we don’t yet understand, or is there something more to 3I/ATLAS? Share your thoughts in the comments—let’s spark a discussion!