Observations of the interstellar object 3I/ATLAS following its perihelion passage have revealed two anomalies that challenge conventional cometary behavior. A Spanish research team measured the outbound gas stream and found it moving faster toward the Sun than away from it—a counterintuitive result, since thermal sublimation on the sun-facing side of a melting object should push material outward, not inward.
The chemical composition presents an equally puzzling absence. Sulfur, a compound detected in every comet measured to date, is completely absent from 3I/ATLAS. Meanwhile, carbon and oxygen compounds are present and concentrated in the outbound material. A Japanese team independently confirmed that carbon dioxide continues to stream from the object during its outbound trajectory.
These findings, documented in two peer-reviewed papers, suggest either unknown mechanisms governing the object’s outgassing behavior or properties fundamentally different from standard cometary models. The absence of sulfur alone represents a significant departure from the chemical baseline established across our solar system’s comet population.
If 3I/ATLAS exhibits outgassing physics that contradicts established models of thermal sublimation, what alternative mechanisms—whether exotic material properties, internal heat sources, or processes we have yet to identify—might explain gas being driven toward rather than away from solar heating?
Source: UFO