Signals from the Unknown

The universe is full of signals. Proving that one is artificial is the hard part. Pulsars, magnetars, masers, fast radio bursts, satellites and even equipment on Earth can all create patterns that look extraordinary before the source is understood.

Signals from the Unknown traces modern SETI from Project Ozma and the famous 1420 MHz hydrogen line to the Wow! Signal, its modern reanalysis, BLC1, natural radio mimics and the practical problem of radio-frequency interference. It explains how candidate signals are ranked, rejected and—if they survive—confirmed through independent observation.

The book then looks beyond radio toward the wider search for technosignatures. No signal here is presented as confirmed extraterrestrial technology. Instead, readers see exactly what an authentic discovery would need to survive before humanity could responsibly say that someone else had transmitted from the stars.