Messaging to extraterrestrial intelligence (METI) is a branch of study concerned with
constructing and broadcasting a message toward habitable planets. Since the Arecibo message of 1974, the handful of METI broadcasts have increased in content and complexity, but the lack of an established protocol has produced unorganized or cryptic messages that could be difficult to 2interpret. Here we outline the development of a self-consistent protocol for messaging toextraterrestrial intelligence that provides constraints and guidelines for the construction of amessage in order to maximize the probability that the message effectively communicates. AMETI protocol considers several factors including signal encoding, message length, informationcontent, anthropocentrism, transmission method, and transmission periodicity. Once developed,the protocol will be released for testing on different human groups worldwide and across culturalboundaries. An effective message to extraterrestrials should at least be understandable byhumans, and releasing the protocol for testing will allow us to improve the protocol and developpotential messages. Through an interactive website, users across the world will be able to createand exchange messages that follow the protocol in order to discover the types of messages bettersuited for cross-cultural communication. The development of a METI protocol will serve toimprove the quality of messages to extraterrestrials, foster international collaboration, and extendastrobiology outreach to the public.
constructing and broadcasting a message toward habitable planets. Since the Arecibo message of 1974, the handful of METI broadcasts have increased in content and complexity, but the lack of an established protocol has produced unorganized or cryptic messages that could be difficult to 2interpret. Here we outline the development of a self-consistent protocol for messaging toextraterrestrial intelligence that provides constraints and guidelines for the construction of amessage in order to maximize the probability that the message effectively communicates. AMETI protocol considers several factors including signal encoding, message length, informationcontent, anthropocentrism, transmission method, and transmission periodicity. Once developed,the protocol will be released for testing on different human groups worldwide and across culturalboundaries. An effective message to extraterrestrials should at least be understandable byhumans, and releasing the protocol for testing will allow us to improve the protocol and developpotential messages. Through an interactive website, users across the world will be able to createand exchange messages that follow the protocol in order to discover the types of messages bettersuited for cross-cultural communication. The development of a METI protocol will serve toimprove the quality of messages to extraterrestrials, foster international collaboration, and extendastrobiology outreach to the public.