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Exo-Intelligence Atlas
Paradi / Radio messaging
Radio remains the most culturally and technically central contact channel
Contact Protocols / protocol
Radio messaging
Radio messaging remains attractive because it is mature, comparatively forgiving, and deeply embedded in SETI history.
Contact ProtocolsConcept
Radio remains the most culturally and technically central contact channel
The easiest communication experiments to reason about are still mostly radio-first.
Key points
Radio supports narrowband beacon strategies and broad symbolic transmissions.
Beam width, power, frequency choice, and repetition matter more than science-fiction aesthetics.
Arecibo and modern SETI both keep radio central.
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Contact Protocolsprotocol
IAA post-detection protocol
1989+
Verify first, announce carefully, coordinate globally
The IAA post-detection declaration is one of the clearest public documents outlining what responsible behavior after a candidate detection should look like.
2 referencesOpen dossier
Contact Protocolsprotocol
IAA reply protocol
1995+
No reply should be treated as a unilateral hobby project
The reply protocol makes the governance point explicit: if humanity ever decides to respond, it should not be done casually or by a single actor acting for everyone.
2 referencesOpen dossier
Contact Protocolsprotocol
Draft principles for sending communications to ETI
2025
Outbound messaging has an active governance debate
The draft position paper captures the still-open argument over whether, when, and how humanity should deliberately send messages toward extraterrestrial intelligence.
2 referencesOpen dossier