What is Messaging Extraterrestrial Intelligence (METI)?
- Type
- Background entry
- Sources
- 8
Deliberate Earth broadcasts aimed at contacting extraterrestrials could permanently reveal our presence.
Summary
METI is a technically deliberate extension of the search for extraterrestrial intelligence: rather than merely listening, it constructs and broadcasts signals intended to initiate contact. The strongest mainstream concern is not that transmission is impossible, but that humanity lacks reliable knowledge of extraterrestrial intentions, capabilities, or the consequences of announcing our presence. That uncertainty supports international debate and governance before powerful transmissions continue.
- CommunicationMessages must account for encoding, length, information content, cultural bias, transmission method, and repetition.
- GovernanceDecisions with potentially species-wide consequences should not rest solely with a small number of technically capable transmitters.
- RiskThe consequences of contact cannot currently be predicted from available evidence.
- METI uses powerful communications equipment to transmit intentional messages toward unknown extraterrestrial intelligences.
- A proposed METI protocol addresses signal encoding, message length, information content, anthropocentrism, transmission method, and periodicity.
- Critics argue that extraterrestrial reactions, intentions, and capabilities are presently unknowable, making broad international deliberation important.
Deeper Insight
METI turns a powerful transmitter into a megaphone for Earth. The few who aim it may speak for everyone.
SETI listens to the dark. METI points powerful transmitters at other stars and sends structured messages, from mathematics to music. That flips the problem: a small group can announce humanity before humanity has agreed what to say, or what an answer might bring. Cosmic silence was passive. Broadcasting makes it a choice with consequences for everyone.
- What it could changeMessage design could become a new form of diplomacy, built for minds we know nothing about.
- How it touches todayThe consent fight is already here, because METI can send a message aimed at everyone without asking everyone.
- Our futureIf broadcasting outruns agreement, humanity could lose the right to choose its first introduction.
- METI advocates describe it as the proactive counterpart to SETI, transmitting messages in hopes of eliciting a response.
- Supporters argue that SETI was historically conceived as a two-way communication effort, while modern practice often emphasizes passive monitoring.
- METI projects have explored scientific tutorials, mathematical content, music, and other material as possible interstellar messages.
Sources · 8
Featured · Primary source · arxiv.org
[1101.4968] A Protocol for Messaging to Extraterrestrial Intelligence
[1101.4968] A Protocol for Messaging to Extraterrestrial Intelligence [Submitted on 25 Jan 2011 (v1), last revised 2 Feb 2011 (this version, v2)] # Title: A Protocol for Messaging to Extraterrestrial Intelligence Authors: Dimitra Atri (U Kansas), Julia DeMarines (International Space U), Jacob Haqq-M
Read sourceAnalysis · sciencefocus.com
Should we be signalling our existence to alien life? - BBC Science Focus Magazine
Should we be signalling our existence to alien life? - BBC Science Focus Magazine # Should we be signalling our existence to alien life? We speak to astrobiologist and extraterrestrial researcher Dr Douglas Vakoch about transmitting messages into the cosmos in the hope of finding intelligent extrate
Read sourceAnalysis · newscientist.com
Alien contact: METI group want to send second message to TRAPPIST-1 system | New Scientist
Alien contact: METI group want to send second message to TRAPPIST-1 system | New Scientist # Group that wants to contact aliens will transmit to TRAPPIST-1 system METI, an organisation aiming to make contact with other civilisations, will send out its second message from Goonhilly Satellite Earth St
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