# Source notes

This submission uses only the facts locked in the bounty brief:

- For most of the past 60 years, SETI radio searches have concentrated on a narrow 1.42–1.66 GHz slice sometimes called the water hole.
- Hydrogen and hydroxyl emit in that region; because they are the two components of water, researchers reasoned that another civilization might select the same conspicuous meeting place.
- Millimetre and submillimetre bands at much higher frequencies remain almost completely unexplored for this purpose.
- Louisa Mason of the University of Manchester presented work at the 2026 Royal Astronomical Society National Astronomy Meeting in Birmingham using archived ALMA observations from Chile.
- That work searched two narrow windows in ALMA Band 3, at 90.642 and 93.151 GHz, and found no candidate signals above the stated thresholds.
- A separate re-analysis described in the brief found that 1,327 observations previously credited with about 288,000 stars using Gaia catalogue data covered roughly 6.1 million stars when evaluated with the Besançon model of the galaxy.

The artwork does not imply detection and introduces no figures, claims, publications, or links beyond the locked brief.