Circa 2045: The Dawn of the Ethereal Frequency. The year 2045 will forever be etched into the annals of human history, not by conflict or technological leap, but by a sound—an impossible, metallic hum echoing across every seismic station, every submarine sonar, and every backyard radio telescope.

It was precisely 03:00:00 AM Coordinated Universal Time (UTC) on September 17, 2045, when the anomaly occurred. The deep-space probe Orion-X, currently on a long-duration mission near the asteroid belt, was the first to register the signature: a perfectly modulated, sinusoidal wave. The source was unmistakable: 31 Atlas, one of the largest asteroids in the main belt, approximately 200 kilometers in diameter.
Initial reports, dismissed by skeptics as geophysical interference or satellite malfunction, quickly coalesced into an irrefutable observation: the global ‘whistle’ was a tone of pure, synthesized metal, and its frequency, measured to an unprecedented precision of $\pm 0.00001$ Hz, exactly matched the asteroid’s known, precessional spin frequency.
This correlation was statistically impossible under known astrophysics. An inert, monolithic space rock, subject only to gravitational and rotational forces, cannot spontaneously emit a coherent signal directly proportional to its mechanical rotation.

The implication was immediate, terrifying, and profoundly exhilarating: 31 Atlas was not a rock; it was a machine. A constructed artifact, dormant for eons, whose rotation had finally hit a resonant harmonic, activating a global broadcast. This event, later dubbed the ‘Atlas Harmonic’, fundamentally shifted humanity’s understanding of its place in the cosmos and opened the floodgates for what many had long suspected: Unidentified Flying Objects (UFOs), or as the newly formed Trans-Stellar Phenomena Authority (TSPA) classified them, Extra-Solarian Reconnaissance Vehicles (ESRVs), were not mere optical illusions. They were the reconnaissance probes of the very civilization that had forged the colossal artifact now humming in our celestial backyard.