“If history is any guide, then perhaps the first signatures of extraterrestrial intelligence will too be highly atypical, ‘loud’ examples of their broader class.” In that line from The Eschatian Hypothesis, astronomer David Kipping turns a familiar search for alien life into a more unsettling idea: the first clear sign of another civilization may not be a greeting at all, but evidence of instability.
The argument begins with a problem astronomers know well. Telescopes do not reveal the universe in proportion to what is most common; they reveal what is easiest to notice. Early exoplanet discoveries offered a classic lesson. Some of the first confirmed worlds were found around pulsars, even though only eight of 6,052 confirmed exoplanets were known around pulsars in the 2025 archive cited by the paper. They were not typical planets. They were simply easier to detect with the methods available.
The same bias shows up across the sky. Giant stars dominate naked-eye stargazing despite being rare, and supernovae are observed in huge numbers because they flare with extraordinary brightness. In astronomy, the first thing seen is often the loudest thing, not the most representative.
Kipping extends that logic to technosignatures, the observable traces of technology. A long-lived, stable civilization might produce only faint and routine signatures: modest radio leakage, localized light, or subtle atmospheric chemistry. Earth itself offers that example. According to SETI research, everyday signals such as 4G LTE emissions detectable within about four light years are not especially conspicuous on interstellar scales, and many stronger signals are directional or fleeting. That means a quiet technological world may be real and active without being easy to spot. By contrast, a civilization undergoing a brief, extreme episode could become visible across a far larger volume of space.
That is the core of the Eschatian idea: a civilization can be rare in its loud phase and still dominate detections because brightness expands the searchable volume so dramatically. Kipping’s toy model shows that if a civilization is loud for only 10-6 of its lifetime, it can still be the first type found if its signal is bright enough. One example in the paper states that a society loud for that tiny fraction of its history would need to release about 1% of its lifetime observable energy budget during that short interval to outrun quieter populations in detectability.
That does not require a deliberate beacon. It can also describe a civilization pushing itself out of equilibrium. The paper points to possible technosignatures of unsustainable activity, including climate alteration, industrial pollutants, and atmospheric chemicals. In that framework, a strong signal is not merely communication. It is a side effect of a system under stress.
The search strategy changes with that premise. Rather than looking only for neatly engineered messages, astronomers may need to watch for anomalies that look more like astrophysical transients than postcards from the stars. Kipping argues that real-time alert brokers handling up to 1 million alerts per night from ZTF, with even larger streams expected from Rubin Observatory surveys, create the right environment for that work. These systems were built to catch supernovae and other changing phenomena, but they are also well suited to flagging events whose flux, spectrum, or motion resist ordinary explanation.
That possibility shifts first contact away from fiction’s usual imagery. The first alien signal may be bright precisely because it is brief, unmistakable because it is unsustainable, and detectable not because it represents the cosmic norm, but because the universe often reveals its extremes before its averages.
