Scientists Discover Interstellar Object 3I/ATLAS Wobbles as It Travels

By Space.Fan Editorial DeskSeptember 21, 2026 at 11:03 AM UTC

Researchers have tracked a strange object from outside our solar system and found that it spins and wobbles as it moves.

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The Drop

Astronomers have been studying a rare visitor from deep space called 3I/ATLAS. This object is special because it did not form in our own solar system. By looking at images taken by the Hubble Space Telescope, scientists noticed that the object has long, dusty trails that look like jets. These jets change their positions in a repeating pattern over time. By carefully measuring how these jets move, the team found that the object spins once every 7.1 hours. This data was confirmed by also looking at changes in the object's brightness. When the object rotates, its brightness changes in the exact same 7.1-hour rhythm, which acts like a clock for the spinning object. The researchers believe this wobble is caused by the object spinning in an irregular way as it flies through space. It is not spinning smoothly like a top; instead, it is tilting and swaying in a motion called precession. This motion causes the gas and dust jets on its surface to shift their direction as it moves.

Why It Matters

Understanding how these interstellar visitors move helps scientists learn what they are made of and how they were shaped before arriving here. By measuring the wobble, researchers can figure out if the object is solid like a rock or if it has a more complex structure. It tells us that these objects are not just floating rocks, but dynamic bodies that react to the sunlight as they travel.

The Catch

While the 7.1-hour cycle is clear, the exact shape of the object remains unknown. The wobbling motion could be explained in different ways depending on how the object is shaped or if there is uneven activity on its surface. More data is needed to create a perfect 3D model of how it tumbles.

Put That in Perspective

This is a rare chance to study an object that came from outside our neighborhood. Before recent years, we had very few chances to see such interstellar travelers up close, so every measurement helps build a better picture of what exists in the wider galaxy.

Source September 21, 2026

Toni Scarmato and Abraham Loeb

Toni Scarmato’s Astronomical Observatory and Harvard University·The Astrophysical Journal·10.3847/1538-4357/ae8a4a

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