gnostek
- 01Ronald Bracewell published the probe concept in Nature in 1960, predating SETI's first radio search by weeks.
- 02The logic inverts SETI: instead of broadcasting, an advanced civilization sends a silent listener and waits for us to mature.
- 03ʻOumuamua's anomalous trajectory briefly renewed serious discussion of the Bracewell probe hypothesis among astronomers.