Humanity’s Complete Record of Radio-Active Comets and the Unexplained Frequency from 3I/ATLAS

That is the part of this investigation that sent a chill up my spine.

The hydroxyl radical produces spectral lines at 1665.4018 and 1667.3590 MHz—a scientifically important range nicknamed the “water hole” because it sits between hydrogen’s 21-cm line and hydroxyl’s rotational emissions, forming a naturally quiet region that SETI researchers have pointed to for fifty years as the most logical channel for any civilization to broadcast.

The fact that humanity’s third interstellar object—3I/ATLAS—registered not emission but absorption at these same frequencies, just five days before its perihelion, violates decades of cometary physics. Heating from the Sun should have maximized OH emission, not suppressed it. And no known comet in recorded astronomy has ever displayed behavior remotely like this.

As I’ve written for months, Avi Loeb remains the leading authority on the scientific anomalies surrounding 3I/ATLAS, and his warning has been clear: if this signature repeats at closest Earth approach on December 19, 2025, we are no longer talking about an ordinary interstellar rock. What is at stake is nothing less than determining whether this object is natural or artificial.