THE REFINED FUEL: They Clocked the Exhaust of 3I/ATLAS at Closest Approach. Half Speed. Wrong Direction. And the Sulfur Is Gone.
A team in Spain just ran the most comprehensive chemical survey of the interstellar object ever attempted at closest approach to the Sun. What they found describes an engine, not a comet.
Key Claims
7- A team led by Nicolas Biver at the Paris Observatory measured the gas coming off 3I/ATLAS at 0.37 kilometers per second.factual
On November 1 through 3, 2025, three days after closest approach to the Sun, a team led by Nicolas Biver at the Paris Observatory pointed Europe’s largest millimeter telescope at 3I/ATLAS and measured the gas coming off the object at peak output.
- The gas from 3I/ATLAS moves faster toward the Sun than away from it.factual
The gas moves faster toward the Sun than away from it.
- The Sentinel Dossier identified the sunward jet as a retro-rocket.interpretation
The Sentinel Dossier identified the sunward jet as a retro-rocket.
- The carbon-oxygen chemistry of 3I/ATLAS is loaded, with sulfur absent.factual
The carbon and oxygen compounds are elevated. Sulfur is gone.
- The water output of 3I/ATLAS is nine times the capacity of the physical surface.factual
To produce that much water from the surface alone, the nucleus would need to be nine times its own size in pure exposed ice.
- Shinnaka's group found carbon dioxide still elevated above typical comets on the outbound leg.factual
Carbon dioxide was still elevated above typical comets, comparable to the previous interstellar visitor, 2I/Borisov.
- The drive of 3I/ATLAS was on when the object was far from the Sun and heading in, and it is still on now.interpretation
The drive was on when the object was far from the Sun and heading in. It is still on now, far from the Sun and heading out.
Evidence
5Event timeline
3Publication of Biver and Shinnaka papers
The papers by Biver et al. and Shinnaka et al. were published.
Shinnaka's group observes 3I/ATLAS
Yoshiharu Shinnaka’s group observed 3I from Hawai’i’s Subaru Telescope.
Biver's team measures 3I/ATLAS
Nicolas Biver's team measured the gas coming off 3I/ATLAS at closest approach.
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