The Last Cry of an Alien Civilization ⚡ экспресс
Original: "The Eschatian Hypothesis"
Most likely, we'll notice the first alien civilization by its anomalously bright flash — possibly a dying one.
Links in the knowledge graph 1
A flash brighter than a star — not a supernova, but the last 'cry' of a dying civilization. A new hypothesis says: first contact with aliens will most likely happen just like that. A fleeting distress signal from the other end of the Galaxy could be our greatest discovery.
🎯 An example of a 'loud' technology might be a Dyson sphere — a giant shell around a star that an advanced civilization could build to harvest all its energy. Such a structure would completely enclose the star, but would itself glow in infrared, giving away its creators.
\frac{E_{\text{loud}}}{E_{\text{total}}} \gtrsim 0.01
The ratio of energy emitted in the bright phase to the civilization's total energy must be at least about 1%.