The interstellar object 3I/ATLAS, which has captivated the astronomical community since its detection in July, reached its perihelion—the point closest to the Sun—on October 29, 2025. This event has been highly anticipated, and it could reveal significant insights into the true nature of this celestial visitor. Imagine watching a comet streak across the sky, hoping to glean secrets about where it came from and what it can tell us about the universe.
The key event: confirmed perihelion
On that pivotal day, 3I/ATLAS was approximately 1.356 million kilometers from the Sun. The scientific community was keenly observing what this moment would bring:
The extreme heat from the Sun should cause the maximum sublimation of ices in the object’s core, resulting in a notable increase in gas and dust production. As it approached the Sun, reports indicated a remarkable increase in brightness, which is typical for such objects.
The perihelion also meant that 3I/ATLAS achieved its highest orbital velocity, following a hyperbolic trajectory that would ultimately lead it out of our solar system.
The propulsion test theory
The perihelion event was especially critical for those exploring the theory that 3I/ATLAS may not be merely a comet, but possibly a technological artifact. When the object passed near the Sun, it briefly became obscured by the solar glare, creating a unique moment for any hypothetical craft with controlled propulsion to potentially execute acceleration or deceleration maneuvers. This is known as the Oberth Effect.
The theory posits that if 3I/ATLAS were indeed technological, the following 24 to 48 hours would be telling. If the object changed direction in a way that’s inexplicable by the normal behavior of a comet, it could suggest that we’re not dealing with a natural phenomenon, but with something beyond human comprehension.
What is the current state of observation?
At present, scientists are in a state of watchful anticipation:
Due to its proximity to the Sun, 3I/ATLAS is not currently observable with ground-based telescopes. This condition of temporary obscuration will end as the object moves away from our star.
A new phase is set to begin at the end of November into December, when astronomers expect the object to reappear in the sky, likely visible through powerful telescopes. The goal now is to accurately plot its trajectory upon reemergence. If its path aligns perfectly with expectations for a natural comet, speculation regarding a technological origin could be put to rest. However, any anomalous deviation may keep the door ajar for further investigation.
It’s also worth noting that the space agencies involved have confirmed that, regardless of its origins, 3I/ATLAS poses no impact threat to Earth. As the object continues its journey, the focus will shift from the perihelion to analyzing its post-perihelion behavior, which will likely influence the narrative surrounding this extraordinary interstellar visitor.
The event at perihelion was the climax of 3I/ATLAS’s activity; how it behaves next will determine the next chapter in this fascinating story of an interstellar traveler.
